Any which make the feats more possible. For me my best example is X character survive feats. With 2+ AA I can go in with Reva, 2-3 inquisitors and whoever needs to survive and the enemies kill themselves on turn one leaving the required character alive. This works in most datacron nodes until 0% stamina so is very efficient. It may not be the only way, but it’s the best way I have found to multitask and make less grindy.
The Enchanted Assistance disk is amazing for any Geo-, or QA-related feats. The Gungans gain TM and bonus turns anyway, so it's hard to track, but I think it also helps the Gungans -- not that the Gungans have any problems in Conquest. It also makes Mon Mothma relevant, sort of. She's slow compared to the rest of the troop and her summon doesn't taunt, but it's probably still a serious boost to the squad after the rebel summon gets out there. I'm sure it's better with Luthen, but TBH since there aren't really any rebel-focussed feats I haven't even tried it with MM or Luthen.
