Some other Gammon variant suggestions I have, but of course each would take more programming and such so would be more time to make are:
1) A mix between Tabula gammon and Russian Gammon. Basicly like "race", all pieces start off the board - BOTH players race the same direction around the board, bring in their pieces in the same area - can only move their pieces 1/2 way around the board until all of their pieces have entered the board - 2 dice only - no special double rules - rest of the rules like current gammon/race rules.
2) Domino-Gammon - I have since seen some other versions talked about, but linked are the rules that I have made up for the game.
Plus is was recently suggestion on the feature request board, these:
(Cacher) Jouez une partie en temps réel avec un joueur en ligne! Pour que cela soit possible, vous et votre adversaire devez choisir l'option "Jouer et rester ici" par défaut puis recharger la page avec la touche F5. (TeamBundy) (Montrer toutes les astuces)