I don't understand your request
You could write your own plugin very easily that does that...
You already win 2 gold on round win, so you would need to check each player, and if they are on the losing team give them 1 gold.
Ah, maybe it's only XP.
Still, it's a very easy plugin to write.
Use the OnRoundEnd function, check the player against winning team, give them 2 gold if so, 1 if not... Very easy plugin.