I use a ROA for woodchucks. It isn't legal here for deer or small game. In fact in PA, revolvers must be less than 23 cal for small game, so cap and ball guns are pretty much out.
If the Crocket is like the other stuff sold by Tradition, it would take a bit of work, to get it to be accurate enough for small game. Traditions ought to offer the gun with a single set trigger and a lock with a fly in it. I think that could be a great small game and target gun, with those added features. In addition, the cost of putting a better lock and a single set for them would only add about $30 to the wholesale cost. For after market alterations, it would take an entire new lock and a set trigger making it an additional $120 bucks. The folks at traditions could really improve the desirability of their guns with just a little extra effort. The rifle has set triggers and a better lock already. Why not incorporate the same into the companion pistol?