I have to agree that selling each Gameline as it's own app is a turn off. I would definitely buy a program for $25-30 that handled all of them in the same app as you released them, but I am not likely to buy one for each system as a seperate app at the $8 price point. Ideally what I'd want is something like Hero Lab, but for the 40k RPGs.
With regard to the Gear/Vehicles thing: I'd like to be able to keep track of any Modifications or Upgrades a character's weapon has and the bonuses/penalties they provide. Same thing for Vehicles, though it would also be nice to track if/how a vehicle is damaged as well.
As I said, there is nothing set beyond the two apps planned at the moment. I like the idea of having one app for everything, but then it would be overpriced for people who only play one or two systems, which is the majority (at least thats what our feedback indicates). In my opinion, there will be ways to solve this in a way that everyone is happy. But for the moment, we will focus all our efforts on expanding the DH app and think about the other systems later :-)
Modifcations and Upgrades for weapons are a point we don't track very well in the app, that's right. We will dive into the rulebook to see if there is a good and user friendly way to add this. Sames goes for the vehicles, this is just something we did not had the time to implent yet. We wanted to give the user all of the options displayed on the character sheet first and then add other features.