There are days where all I want to do is level quietly or craft, or queue for random dungeons. You know, those days where you don't really want to be bothered by anyone, but you also don't want to tell anyone to "screw off" because you don't want to be an ass.

I propose an "appear offline" type toggle, where your name will be grayed out people's friends' lists or FC rosters. Or, if that's too difficult, an option to disable people sending you /tells. That way you can hide alone in an inn room or in a big, open area like Coerthas or East Thanalan with the same intent.