the main difference between palp and Tie Shuttle (and manaroo, while we're here, at least until she gets evades) is palp can also layer on top of existing modifiers
focus and re-rolls do not stack in the same roll
this makes the bomber (in addition to low offense and range restrictions, which the lambda and palp respectively do not suffer from) far more situational
now with Manaroo, who operates similarly to the support Tie Shuttle (albeit far more effectively because she packs feedback array and can therefore contribute to battle without using the modifiers she gives out like candy) discounting the unlimited range, there are a few ships that REALLY benefit from here ability
there's the advent of Dengaroo (with manny and her TPed BF), which abuses Dengar's ability with a BOATLOAD of mods courtesy of the lovely lady
there's also some of the most fun you will ever have: torpedo boats with manaroo as a bumpmaster (all you need is adaptability and feedback array)
with one measly focus , a torpscout can spit out a near guaranteed four hits. Manaroo seals that focus even after
- bumping (including self bumping, which you can use to deny range 1)
- going through obstacles
- stress (ESPECIALLY zuckuss; zuckuss on a torp boat is the best **** thing ever and you should try it)
- 4k or right segnor's (HERESY)!
etc.
so, if you want Tie Shuttle support to do work, you're going to want to find something that either chews through modifiers like an army of angry fire ants, or something capable of turning a single additional focus/TL into some impressive fireworks
if you find someone already swimming in mods, like an ace, palpatine is just superior
This is why I think it goes best with Defenders who will generally only have one action and with Omega Leader who likes to barrel roll to clear arcs. In particular, double-focussing Rexler is tight.
The other list I tried when the Bomber Shuttle was first spoiled is Adaptability Tractor TIE/D Vessery, Redline and a Bomber Shuttle. Obviously, you don't use Systems Officer in this instance so you can stick Tactician in there, or Rebel Captive, but giving two big hitters who can do double attacks with full TL rerolls, double focus each makes for REALLY tough choices about who to murder first.