I don't see a problem with the game eventually having three currencies. Computers are great at managing numbers. It could show you how much gold you have, and if you have Silver left over which doesn't divide into 10, it can show you how many silver pieces you have. If you have copper left over which doesn't divide into 10, it can show you how much copper you have left. Tooltips you hover over remind you that 10 Copper = 1 Silver, 10 Silver = 1 Gold. Or there are some other ways it could be done.

I definitely don't think the Jump (Disengage) should be something any class can do on every turn, as that steps too much on those classes which get it as bonus features. At most, it should be one disengage per battle for other classes (so you need to pick it carefully), Rogues get it once a round.