i have decompiled the winamp plugin using Lutz Roeders .Net Reflector into c# source. it wasnt my idea, found it in a post on another forum. once you do that anyone with some c knowledge should be able to make a plugin to use windows messaging and control the osd themselves with custom text or no display at all.
I did this for my custom frontend and it works well. pm me in a couple of days if you dont understand how and i should be able to knock you up a plugin.