Crow550, TCP Vegas is a congestion control algorithm for a sending TCP itself. That is, it would only make a difference for connections that originate from your router, NOT for connections that are being forwarded through your router. So it's pretty much useless.
Last I had heard, there are serious questions about whether TCP Vegas is well behaved. It's easy to make a TCP implementation that gets slightly better performance FOR YOU, but when everyone else on a network link does the same thing, everyone (you included) gets less goodput. TCP congestion control is hard.