there is a work around, its just a big, big pain. First you have to burn all your iTunes files onto audio CD's (I said it was a big pain). I just went though and turned them all into 1.2 hr play lists. Then move your entire iTunes library to a different folder. Then in iTunes go to Edit menu, then preferences. Click on the Import settings button and make sure your import settings are set to mp3 and whatever bit rate you prefer. Then go through and import all those discs you burned as mp3's and voila, your entire iTunes library is now mp3 audio compatible with sync. Good luck.
2009 F-150 XLT SCrew w/ Sync & Chrome Package
1999 F-150 XLT SuperCab (Deceased...for the moment)