I appreciate the effort made into syncing with foobar, but tunefusion doesn't have the functionality I need to actually use it.

* it doesn't recognize my custom tags
* it doesn't sync playback stats between the mobile and PC libraries.
* it doesn't let me sync a foobar playlist
* the smart playlist tool has limited selection
* the encoding tool doesn't let me use my own encoder

To be completely honest, I don't understand why you've made a separate app instead of a foobar component.