In NWN2 whenever you left the inn a little pop-up would appear. On the left would be the characters not in your party, and on the right would be the characters in your party. (or vice versa, whatever)
From that window you could quickly change out who would be in your party once you left the inn. I thought that was a nice feature that made it easy to change out characters.
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That said, once upon a time I heard it said that the game would eventually force you to pick your team. I know some people are against that but I would personally LOVE it. I'd much have a story moment that forced me to make the hard choice and cull myself down to only three companions.
