The problem with comparing LS to Explorer is that the LS devs can't know every hidden function of explorer. The explorer shell knows how to find out from the Control Panel what monitor is where and how big...LS can't.

Now...as for problems with multi-monitor setups...it normally isn't LS skrewing up...it is the themer not thinking about more stuff off to the right. LS can't account for lack of thought on the end of the themer.