Pah... it doesn't work that way, EW. You can have a cloak because it's already in the game engine. But the Mace, the Leech, and the new guns from WCA are not in the WC2 game engine. Using them produces no results - that is, instead of the weapon, you see a few funny signs, and you can't fire it. Nor can your wingmen - the weapons simply don't exist.
Interestingly enough, the same goes for the Morningstar's jump drive. It just doesn't work. Which is rather odd, since I don't recall any difference between the way the 'Star jump drive works and the way the Broadsword's and Crossbow's drives work.
Anyway, the moral of the story is, if you're gonna make WC2 missions, use the SO2 engine rather than the original WC2 engine. And forget about WCA weapons, unfortunately (though I suppose the ships themselves might be importable... you'd have to check HCl's page).
I've tried PTC-capable Ferrets before, but I vaguely recall having some sort of trouble with them... I think that for some reason, I couldn't fire the PTC. But I can't remember, since it was a long, long, long time ago.