I dont see Fencer setting up two versions of the same game. But either restricting the c2-c3 opening move or somehow adding something like a dice roll to see which color would start the game is an option. Similir to backgammon where the dice decide the color. It wouldn't prevent the c2-c3 opening but would cut down on people padding their ratings by only playing one color.
(hide) If you want to play a game with an opponent of a similar level, you can define a required BKR range for a new game invitation. Then nobody with a BKR outside this range will be able to see/accept it. (Katechka) (show all tips)