Well here is 1 of my FAVOURITE wayz of making very powerful characters:
(Spoilers)
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Play a multiplayer game and by the time u get to the final save and have all the Tears of Bhaal go and drop them all on the ground or give them to another one of the chars. Then get the advantages, but not the last 1. Save, Load the save b4 the bonus' and modify the main character and load him/her from the onther save and then get the bonus' again

Very good and easy way of getting LOTS of great bonus'
But if u want the +1 to wisdom and Charisma or the +2 to strength then u have to fight Irenicus, but u can Load the modified char from the final save slot of CHAR filez
Workz a wonder... though does make the game a bit 2 easy