It's a problem. I too have a number of iTunes files. The front ends often use mediaplayer as the playback mechanism. iTunes, like other players isn't really ideal for controlling your music via touchscreen.
However, there is an iTunes SDK and writing an app in VB with big buttons to control the music is pretty damn easy, but of course, that's one of the reasons the front end software is so good -why reinvent the wheel?! Still, I'd think it's unlikely that any of the front ends will support it as they already have playback built in.
[Edit] I realized you were talking about music you encoded in AAC format, not necessarily iTunes music with the built in DRM. You can use iTunes to convert the library to mp3 if you want. Not sure about whether AAC codecs are available.