Is it possible to control more than one side in the various 4-player coin games (FitL, Liberty or Death, etc.)? FitL seems to work for 2 players, but in LoD you can only activate Brilliant Strokes for the side you chose at the beginning of the game.
It all depends on how the module is configured. VASSAL currently only supports a user occupying one player side at a time, but modules can be configured with defined player sides that can access more than one set of side-exclusive things (cards, hands, pieces, etc).