It seems to me that there is room for a house rule that causes something bad to happen if the "fight foreign war" action isn't used at least once per turn. Just having a bunch of units off map sitting around seems a bit weak to me.
I agree. I think that it should be something like -1VP per full turn that elapses without an attack or something like that.
I don't think it needs it. The sudden jolt of losing 4 guys off the map is pretty harsh - it doesn't need to be worse.
IMO it's more than useless. For Turkey that's ONE counter for one war and 2 counters for the other one and the English war. Too easy by half. Besides, as stated above there's even less incentive to attack, because if you do the doggone card goes back in the deck.