Well, i havent read all the posts but i suggest a Item Making & Hacking forum, as it seems that there are lotsa posts about this in the BG2 forum. There people could talk about their created items, spells, creatures, expansions etc.
And about melusine said, maybe you will have to delete the Polls forum as it seems that polls are posted mainly here. And maybe the expansion forums should be joined to their "original" game forum (totsc to bg, tob to bg2, how to iwd etc).
My personal idea is that is better to keep a few forums better than a lot, cause that way it will be easier to get responses and it will be easier to navigate the website.
Just some thoughts
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"Let my spells do the dirty work" Ertai, High Sorceror of the Holy Flame