[Nightmare]

I lot more varied actions that go beyond the limiting Good/Evil options. For instance, incorporating another dimension of Lawful/Chaotic (like D&D) would improve the depth and experience. This could be somewhat incorporated into gameplay...For example, Obi-Wan and Palpatine were more Lawful and thus less likely to turn, while Anakin/Vader was arguably more powerful but probably more Chaotic. I dunno, I just think it would make for more interesting gameplay.

This would also allow for more dialogue options. I really hated how in the first game, near then end, you only had the "Come to the light! Surrender and be saved!" or "Fear my wrath! Die fool!" with no real inbetween responses that could still be light or dark, just not mindlessly stupid. The second game was much, much better with believable and convincing dialogue, and I would like to see that continued. Also, some options like "[Vow] I will do this" or "[Lie] I will do this" (a la PS:T) would be nice, and could easily fit with another Lawful/Chaotic dimension.

I would also very, very much like the option of NOT being a Jedi. I really think the first game would've been much more interesting and open if you had the choice of refusing to become a Jedi, and staying as your starting class or something (or maybe, as previously mentioned, becoming a diplomat or a bounty hunter). It would be cool to play a character like Han Solo rather than another Jedi.

And as said by others, tougher puzzles that are optional but that could be brutally difficult.

Tweak the combat system to possibly make it a little more tactical. This would make some battles, especially boss battles, be potentially much more difficult. Combat in the game is way too easy, especially at higher levels (though destroying everything the Trayus Academy solo was certainly fun).

Optional planets and areas would be nice. I'm thinking areas like the Umar Hills and Windspear Hills from BG2: completely optional to the main quest, but awesome areas for sidequests.