okay, here is the stuff:
1.start the game.(see that you have the KSE on or the cheating mode)
2.do all the character thing
3.Skip the prolouge.
now,when the game starts save the game and leave the game (for the KSE) and take the kse open. take your TSL savegame and search thorugh the master Item List,then search for killblaster or killstick.
o the steps1- 3 then Open the cheat console (Make sure you have cheats on)and type in: giveitem killblaster or giveitem killstick,and enjoy the onekill weapons,to end the boss and monster fighting problems
(this does not work on KOTOR 1)