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.
Mancala games are a class of old and well-known games. Many variants are played in Asia and Africa. It might be interesting to see them on Brainking as well.
Advantages:
The rules are simple, not only does that mean it's easy for players to learn, it also means that it's relatively easily to program.
Unlike yet another chess variant (don't read this as a complaint against chess variants...), it adds a totally new game.
There are many variants, all with similar rules. So once a frame work for "sowing games" has been set up, the number of games available on Brainking can be increased quickly.
It may attract a new set of players (next to the chess, checkers, backgammon, pente, lines, and army types...)
The games have been played for a long time, and by many players, so they are probably quite enjoyable.
Disadvantages:
If Fencer starts implementing yet another game, it takes even more time before there's a doubling cube in backgammon. ;-)