I would really like this, and would certainly type up a little character description to go in there.
If a player puts something inappropriate in the box, report them and then a GM can edit it later. Players who abuse this can have their box disabled. Easy as pie.
I predict a lot of players would also use it to record wishlists, so you can make appropriate offers to them for goodies.
It's a good idea, but I'd think the ability for some to abuse it would make it not something that 3R would ever do.