I didn't BUY Vista either

XP > Vista.

No DX10 games available now.
Aero is useless.
Vista wastes resources.
32 Bit Native
BOTCHED job of hardware support.
Drives still lacking.
Etc, etc.

But, I respect your decision to use it. But just be aware that some applications (like multibox) may have issues with the way Vista handles mouse interaction. Try Synergy and see if you have the same problems. If not, then rewrite Multibox to support Vista - it is open source.

Or pay somebody to do so - or beg the current maintainer to add it. I wish I could help you further - I don't use that application personally.