I played a game of SA at Historicon last year with some friends. Two of them went out and bought the rules after that.
My one friend ran 2 French and Indian Wars games using SA in December. The first game was settlers (civilians) vs Indians (lurkers). One Indian was a Shapeshifter and would turn into a bear. Each activation he needed to pass his Resolve Test or he would revert back to human form. Finally, he failed this test while in combat and was killed. The Indians made off with some of the settler women.
The second game consisted of some Rangers (threshold) and male settlers going after the Indians. But the clever Indians led them through an old Indian graveyard similar to the one in the King story Pet Sematary. Now any Indians killed came back as Zombie Indians (made by the guys at Conquest miniatures. Eventually, the Rangers prevailed but it was a bloodbath.
So there was very little supernatural elements to these games. In fact my friend thinks this will be his skirmish game of choice. We actually played large games with about 20 figures per side, on a 5'X8' table (heavily forested). Muskets take one activation to fire, and then another one to load.
I'm afraid the matchlock and firelock muskets for the ECW will need a similar rule. Since, we are probably staying as a skirmish mode we would probably be looking at scenarios such as two Forlorn units finding each other. No reason why this shouldn't work.