KoTOR, while based on SW d20, is not a direct converstion of the ruleset. In the game your attack roll with a lightsaber is modified by either your str or dex, whichever is higher. In effect every character has Weapon Finesse [Lightsaber] for free.
Note that your damage with a lighsaber is modified by str. Note that your attak roll with other melee weapons (vibroblade, stun baton, etc) is modified by str with no option to change it.
Also the feats and skills in the game have been vastly simplified for mass market consumption. The feats more closely resemble their Never Winter Nights counterparts while the skills have been boiled down to only eight (or was it ten) skills. Dont' worry, you will catch on in no time.
Hope you enjoy the game, its the best CRPG I've played in a long time