Ok ... Dener ... Heres my story ...
I have an M505. My AV Panel only works with WinDVD, MusicMatch, and WMP9. However, just like you, I want it to work with Winamp, my main music application.
THE GOOD NEWS: With my system, there is a way to program the hotkey app to work with your program of choice. I believe that your's is also set up the same or similar.
THE BAD NEWS: After weeks of sifting through code, I have come to the conclusion that this is too difficult for me to handle. It required knowledge of XML and a bunch of other things that I dont even know yet. I eventually gave up.
THE OUTLOOK: If anyone out there wants to make their hotkeys work with anything other than the software that came with their lap's and want to do more than talk about it, put a post up in the forum please.
Until then, Dener, Im just going to have to aggree with Anthony3654 and say that it is impossible at this time.