I've used that trick successfully.
Over on aximsite, there was a thread a few weeks back for complaints about WMP10. Most of the complaints I've seen focus on button mapping, playlist editing, and album art. Here's how I configure WMP10 so to use it best on my x50v:
http://www.aximsite.com/boards/showp...0&postcount=24
<shameless plug>Includes a link to my freeware playlist editor. </shameless plug>
Jon