The other thing I did before I installed 2.2 was used the Logitech plug-in (even though I have a microsoft keyboard)
http://www.winamp.com/plugins/details.php?id=78516 , which worked for me. I un-installed it when I switched to 2.2 because even if Winamp wasn't the active app the keys worked with it AND the active app (it really wasn't that big of a deal.)
If that doesn't work I've seen people using
RM-X ,but I have no experience with it.
If that doesn't work, I'm stumped.