to bug bt, just go into a BT raid with 3 of your friends (you can do this with 2)
each one must not share t6 tokens, so you could take a hunter, pala and a ROGUE (you MUST take a rogue, they will bug Illidan)
get wowemuhacker for your version of the game, once you are in bt, activate flyhack and go flyng until you get to illidan, once you are at illidan, stay kinda away from the rogue, now tell the rogue to use cloak of shadows and evasion, and charge to illidan, illidan will attack, but of course he wont hurt the rogue because of the spells, now, fast, tell the rogue kide illidan to the columns near of the entrance of the temple summit (giant columns that you see after you go to the stairway)
now just because illidan passed that column, he will be bugged, you will know he is bugged if he walks forward and then go backwards, but if he walk to the left or right, he will get unbugged at some point of the fight and eventually kill you, now go near where illidan was originally standed (its a place where you can look down and see the council) stay here and right click illidan, you will be able to attack him, but you cant use skills like cruzader strike or stuff like that!
enjoy!!