Crossfeed filter for headphone mixing anyone?

[jtstatic]

I was hoping someone to make a crossfeed filter as a pulsar device.. it would be a nice tool to help stereo imaging on headphones.

Here's a similar plugin for mac in VST format.
http://www.midnightwalrus.com/Canz3D/

Or maybe I'd be better buying one of these:
http://home.t-online.de/home/meier-audi ... filter.htm