[LennonCook]

Originally posted by Andraste: For storyline and roleplaying as a good person I would say that you have to keep Imoen. spoiler . . . . as a good player, your main reason for going to spellhold is her rescue - it makes no sense of the storyline to then ditch her. TOB with the Ascension mod also gives a better storyline with her in the party.

I disagree. A good character might not think of Imoen as being in any danger. A paladin, especially one with low Wisdom and/or Intelligance, might even see her as being unstable and so her being locked up actually benificial to the world. Alternatively, they could think her mature enough to look after herself once she's free.
They may want to go to spellhold to investigate the 'power' that Irenicus talks about - how might they use it to do good? It is also apparent that Jon has alot of power, more than the Cowled Wizards, and more than you. And so, a good character - knowing how cruelly Irenicus treats people - might see his imprisonment as not enough.
This game is full of options: you are not pigeon holed into one line of thought. A good character does not have to rescue Imoen to be roleplaying. Infact, to think that way - to roleplay in this game is to do x,y, and z - is actually detriment to roleplay. Roleplaying is thinking as your character. Roleplaying is even becoming your character. It involves making decisions, as your character, and seeing how they play out. However, a "character" is not "A cavalier", or "a chaotic evil half-elf thief". A good character is "Kevin Opperstom, Paladin of the Order of the Most Radiant Heart, Sworn to Aid in the eternal fight against supernatural beasts". A character has a history, and a personality. A character is, thus, a complex person - not a pigeon-holed way of playing a game.
If you can make a good story through your character's eyes, based on your character's experiences, that is good roleplaying. "I invited Imoen to join because I felt she needed support and rehabilitation after what Irenicus did to her" is good roleplaying. "I have Imoen in my party because I'm a good aligned character" is not.