Disclaimer: These questions are pretty nitpicky, so the standard answer to all of these would be: "The GM should decide if the story necessitates it or not". But for those of us that are nitpicky and want to ponder over these minor details, I invite you to join me.

1. How far can a Jetpack go? Are jetpacks designed with repulsorlifts? (core book mentions "anti-grav", but I don't know what the difference is).

2. The smuggler comes with the Hidden Compartments talent, but some ships naturally come with areas that you can hide in, like maintenance grating, crawl spaces, etc. Would it make more sense to you if Hidden Compartments made it so that the object gains a hidden area that's customized (so npcs familiar with the object would not notice), and immune to most scanning equipment?

3. What are the available functions for a ship's sensors? Can it scan for structural integrity? Life signs? Material analysis? It probably can recognize stellar objects like stars, story-type nebulas, but would it be able to give you a complex readout of a planet's atmosphere?

Can it scan itself? (I'm thinking no, since sensors have fire arcs)

For fun, does anyone know if the Falcon can turn it's radar to the sides?

Re: #2 The talent Hidden Storage is poorly written. It implies that the size of the storage is relative to the object that you're hiding stuff in and then tells you that it's a maximum of 1 Encumbrance/rank. Somehow, you can hide people with it on a starship (according to the text), but that would take a minimum of 6 ranks to hide somebody with Brawn 1. The Smuggler in my game has one rank (15 XP from the leftmost column of Scoundrel) and uses it to hide a blaster pistol in the cockpit under his seat. It's never come up in play.

Re: #2 The talent Hidden Storage is poorly written. It implies that the size of the storage is relative to the object that you're hiding stuff in and then tells you that it's a maximum of 1 Encumbrance/rank. Somehow, you can hide people with it on a starship (according to the text), but that would take a minimum of 6 ranks to hide somebody with Brawn 1. The Smuggler in my game has one rank (15 XP from the leftmost column of Scoundrel) and uses it to hide a blaster pistol in the cockpit under his seat. It's never come up in play.

I believe you are applying it wrong then. If you have 1 rank Hidden Storage, and your YT-1300 is a Silhouette 4 freighter, you would get a Hidden Storage encumbrance rating of...

1 encumbrance (base) * 10 (vehicle scale modifier) *4 (silhouette)= 40 encumbrance on a personal scale. Feel free to correct me on that, because I am not positive.

Now the question is, how big is a person? Personally just making stuff up here, but I would say...

5 encumbrance for an astromech, 10 for a human, and 15 for a wookiee, not including equipment. (shrug)

There is no vehicle scale modifier for the Hidden Storage talent, nor does it - as written - account for the Silhouette of the object you're concealing things in. Per the RAW, it conceals (rank) Encumbrance. At best, with three ranks, you can hide a carbine.

Characters (Silhouette 0 or 1) have an Encumbrance value of 5 + Brawn (coincidentally, the same as what they can carry).

"The size of the compartments are proportional to the size of the vehicle or droid in question."

Read as worded, you're right, it can only hold 1 to 3 encumbrance. Read as intended, the sentence I copied down suggests that the encumbrance capacity must somehow scale in accordance to the size of the target.

1. Wookiepedia on distance (for the Z-6, at least):

The Z-6's fuel tank held enough fuel for one minute of continuous operation (20 three-second blasts). Each three second blast moved the wearer up to 100 meters horizontally or 70 meters vertically. A user of standard height and weight could reach a top speed of 145 kilometers per hour with a maximum range of two kilometers.

And according to Wookiepedia as well, their are repulsor lift jet packs (or just Repulsor packs), that exclusively use replusorlifts. They apparently only work in gravity wells. As for what Anti-grav is, if I recall, it's basically low-grade repulsorlifts that are only intended to slow descent, not to completely lift something or propel it like a jetpack.

3. Probably depends on the individual ship and it's intended purpose. Like a TIE wouldn't be able to give you most of those things, but a longe-range scouting/exploring ship, or a shipped outfitted for those purposes would probably be able to scan for atmospheres and life signs at longer range.

Since 2 seems to be covered...

1) the jetpack doesn't have a defined Fuel supply. In previous editions and rulesets they used to (this is where the wookieepedia numbers come from, burst/fuel rating x the rounds it could be used), but not anymore. These days you can handle that sort of thing with stuff like triumph and despair. Which is actually better as it allows far more interesting encounters.

Its also likely well see something more defined when the bounty hunter supp comes out, like a specific model, or a rocket pack.

3a) its up to the gm, but from the movies we know they can at least do atmo analysis, and "life signs" these days, when in doubt, roll for it, the dice are your friends.

3b) I would think it can turn, it looks to be on a mount, and the promo images at least show it can elevate.

1) the jetpack doesn't have a defined Fuel supply ... These days you can handle that sort of thing with stuff like triumph and despair. Which is actually better as it allows far more interesting encounters.

If the Despair represents low fuel, I agree. If it indicates no fuel, then I'm less of a fan.

"Up, up, and awa- oh shi-"

As to the jetpack, you could treat it like the heavy blaster pistol. On a Despair or 3 threat it runs out of fuel. Basically at the end of your turn you need to land if you haven't already.

Going by the films:

A jetpack is too difficult for even Jedi to follow. In episode 2, Obi wan and Anakin are willing to jump out of skyscrapers and leap to possible death from car to car in order to track robots and assassins inside ships.

However, when Jango leaves in a much slower and smaller distance device, they let him get away.

So, Jetpacks must be some crazy good gear if they outrun suicidal Jedi.

1) I'd say a jetpack can go until a Despair is rolled (or numerous threats, like 4+ or something like that). Once these results are produced, and it is decided that these should be used against fuel rather than collision or something else, then I'd give the jetpack 1 more manoeuvre to move - for instance closer to the ground or other area to land. Falling the rest of the way if it cannot reach it with one manoeuvre. It's a vehicle, just remember that - and for some ideas for limitations check out "Under a Black Sun" the final encounter, while that is a damaged jetpack, it could serve to provide some guidelines for limitations on the use of jetpacks, if it is at all needed.

2) The hidden compartment's storage size is relative to the device or ship or droid its in, but it can still only hold 1 encumbrance per rank. Since encumbrance is both weight and size (representing both poorly), some enc 1 things might be too big to be placed inside a droid, but might easily be placed inside a hidden storage compartment inside a starship. I mean, a small droid might hold a holdout blaster, but not be large enough to hold a normal blaster - even if both a encumbrance 1, they are different in size, right? same with brass knuckles compared to combat knife or vibro knife, the brass knuckles are, probably, somewhat smaller and of a different shape than the knives - this could matter in some instances. Heavy clothing, folded, might still take up more space than a blaster pistol or combat knife, but it is enc 1. Also, breath masks, datapad and climbing gear are all 1 encumbrance items, but most likely they will not be of indentical size, the mask or datapad might fit inside an astromech droid, whereas the climbing gear might require a larger droid (a 3PO unit for instance) or something else to fit inside.

3) I think this has been covered somewhat, but use the movies and tcw series as guidelines I guess. You should be able to detect life signs and such, but structural analysis and material (as in a geo-survey) would need special sensors, at least that's my opinion. Of course it could be argued that some exploration vehicles have these as default.

"The size of the compartments are proportional to the size of the vehicle or droid in question."

Read as worded, you're right, it can only hold 1 to 3 encumbrance. Read as intended, the sentence I copied down suggests that the encumbrance capacity must somehow scale in accordance to the size of the target.

Yeah, that sentence you quoted is why I consider the talent to be badly worded. If you feel like looking, there are house rules floating around these forums that try to take the Silhouette of the container into account as your quote suggests.