Maybe it could be called bctc? Like bitcointalk coin, you can get it by posting and cam tip gamble or exchange it for goods or other currencies?
I don't think it is really needed. If you want to tip a person, you can do it by sending them BTC or LTC or any other things. This coin isn't really needed. If they implement this, I think a wallet for this forum will b needed too. Implementing a wallet for the forum will be bad idea. I like your idea but it isn't needed here.
~~MZ~~