One thing I would like to see in KOTOR 2 is making the other classes viable options, as it was in KOTOR they were pretty much a joke. I know that a Jedi is supposed to be a veritable steamroller in combat but I feel that the other classes should get more love than they got.
I tried to make a team composed of a Jedi Guardian(me)/Sniper(Mission)/Heavy Gun specialist(Canderous). This looked pretty good on the paper, but I had to abandon it since it could never compare to the raw damage that a 3 Jedi team dished out. One of the solutions could be to make blasters more lethal since I never felt especially threatened even without blasterdeflection, and therefore made the other more blasterdependant characters pretty much useless.. Anyway, thats just my musings...