Ok, i still found a few bugs. I'll post them here so you can fix them
If you have the plugin running, but winamp isnt. Then if you start winamp it will already automatically change your nick but no song is playing yet so ul see something like, "schaapje (listening to )" instead of just "schaapje". This is not a really big issue because when u press the play button on winamp the problem is already solved.
The second bug i found is that when you do /xwinamptoptions while playing a song, then the new value in /xwinampoptions will be added to your last complete name. So you get something like "schaapje (listening to something) (listening to something)"
So you have to stop winamp before changing your nick, that a bit annoying but still, its not the end of the world
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maybe you're willing to fix it