Add to that, with the Google Summer of Code project, this is one of the areas being looked at, so maybe by the end of the summer we'll see some enhancements here. In
this writeup there are several references to dual weapons and how it could be handled differently.
Particularly this quote
" * make single wielding and dual wielding matter, for instance a dual wielding attack may do half the damage per hit, or maybe even less but give a better chance at a special effect? "
It will be interesting to see what comes of this.