1) I think this is actually a player bug, but I haven't verified this in a while

2) oops

3) this doesn't work in the general case because you can sync onto your empeg from multiple places, so there's basically no way to tell if it was added from another machine or deleted from your primary. this is one of the main reasons this is such a nasty problem ...

4) I don't remember what this features does I don't really use it... I'll check.