Do you miss something on BrainKing.com and would you like to see it here? Post your request into this board! If there is a more specific board for the request, (i.e. game rule changes etc) then it should be posted and discussed on that specific board.
They wouldn't be required to leave a message. Just like when a person leaves a fellowship, they're quite entitled to leave the box blank.
I'd like the option to leave a message for people I remove from HOME. I do this with pawns who haven't been on the site for a few months. I'd like to leave them a message to say if they ever came back, they could re-join.