Well, it is possible to give the appearance of dual wielding. It would mean overwriting some of the existing animations though...Not that difficult a thing to do, really. But as far as truly dual wielding like bg2, until (if) we get the source code for the Infinity Engine, its not possible.
Wizards Of Eregion Expansion Team Presents:
[url="http://groups.yahoo.com/group/IEEAIS"]Infinity Engine Enemy AI Scriptors Council[/url]