I lost my generic copy/paste answer, but the quick answer is "no, and it's never, ever going to happen in a billion, trillion years."
Someone made a winamp plugin at one time, but got shot down quickly by Real. I don't know what ever happened to that website. I also forget what it was called.
Sorry. I wish I could do it, too. That and free midi support. If I had half a wit in programming skills, I'd try to make a
TiMidity++ wrapper, but as it stands, I suck.

And I wouldn't release it anyway until
freepats was done, since it could all be conveniently put together in a GPL package.