I assume that in BG1, once you kill Sarevok, you could continue with quests as long as you do not agree to go to Amn for Bolt (I think that was his name).
What I would like to know is can you continue doing quests in BG2 after you kill Irenicus?
Are there any problems with playing the game this way?
Is there a requirement to do some quests in a certain order? I went to Brynnlaw and through the Underdark before the Circus. This messed up Aerie. However, you able to correct the problem.
One final question, is there a problem with "time" after Irenicus takes your soul? In BG1, you had 10 days to live after Marek poisons you. So I wonder if it similar in BG2.
Thanks for any answers,
Tom