Well, in KOTOR a thing I find amusing in combat is when one of your party members is fighting a foe with a melee weapon, and another party member is standing behind and blasting away at the same foe with a gun. It really shouldn't be possible to do that without the risk of hitting your teammate from behind. I think that when you engage a foe with a melee weapon, your teammates can't open fire on the guy you're attacking for risk of hitting you. Guess it depends on how much the teammate likes you. And vice versa between you and teammates.
And also, I got an idea for combat: instead of everybody running around in the open and blasting at everyone on the other side until everyone on one side is dead, how about having some strategic use for cover, to add an element of strategy into the combat. Like your teammate (who is using a ranged weapon) can take cover behind a trash can (or any short object, I'm not good with examples in Star Wars lol), and he is harder to hit. Or you can manually position yourself against a building's corner and shoot the other side from behind cover. Sometimes your position gets bad during the battle and you'll have to relocate, etc. Like for example, you are behind a rock, and a grenade is thrown behind you. If you have high enough reflex points, you'll automatically leap to the other side of the rock before the grenade explodes.
Just a couple ideas from Full Spectrum Warrior that I think would make the combat in KOTOR more interesting if added.