I'm trying to make actors for the first time in a while, and my first project is a rather lofty one. The first thing I'd like to do is remove all friction from the feet to emulate a sort of "skiing" movement as seen in the Tribes series. I'm not rightly sure if this is even possible, but it seems as if it should be possible if you kept the actor more than a given distance away from the ground and deleted all terrain near the actor with a durability around that of grass or scrap. The other thing is actually unrelated to the actor. I'd like to make a script in which an attached weapon is given an "energy" variable. The amount of energy would affect the mass and velocity of an MOPixel when the weapon is shot. Upon changing those variables, the energy would be depleted and begin to slowly refill.

I would say that you'd have to use Lua for both of those things. For the actor, have it hover like you said. For the weapon, you could store the "energy" variable in Sharpness, and have it managed using Lua on either the particles that the gun fires, a script on the weapon, or both.