if you want to know the cheats that work in the game here they are:
While playing the game, press ~(No Shift) to display the console window. Type "DebugMode 1" (case sensitive) to enable cheat mode. Make sure YOUR character is selected and then use the Following Command that Alters the Alignment with that NPC(Non-Playable Character) Remember you must know the thier designations before using this cheat (Hence the x,y) place the following numbers in place of the x,y (As for khelgar it's (1,150) (including the perenthesis)
rs ga_influence (x,y)
(9,150) Shandra Jerro
(12,150 Ammon Jerro
(13,150) Bevil (if you ask him to fight along with you in Act 3)
if you want to know the rest of the cheats that work for the game, simply Type "commands" in the Console window.