I think a feature that could tell if someone has read your pm would be useful.
It's hard to tell if a noob has read my duel challange and ignored it or not. If not I would like to know so I don't have to waste my time.
This dude was last online like an hour ago, and he has even begun a new animal storygame! He's ignoring you, and because he's actually smart, has decided not to publicly make a fool out of himself, so his attendance in the duel is completely optional.
I think a feature allowing the admins to read everyone's PMs would be very useful. Lol.