Hopefully self explanatory. Not sure if it's possible or not, though.

Possible, but WHY? You're already going to have issues with jets. And the ICBM mod adds rockets for weapons and Galacticraft adds them for space travel. What other reason would you have to use a rocket?

I will never do inter-mod support with mods such as Galacticraft. It's not that I'm against the mod or the developer, it's just that what they want to do and what MTS wants to do are two totally different things and should remain so. It's the same reason I'm not doing inter-mod support with mods such as IE or Buildcraft: they're for ore doubling and power generation, not for transport or cargo hauling. And no, BC pipes don't count as transport.

Crazy experimental aircraft, like the Bell X-1?

plus if we ever get inter-mod support I'll need something so I can fly on the moon

Marking this as something I won't do. While I can see rockets being fun, they really aren't what MTS is designed to emulate. MTS is mainly for transport craft, not weaponized craft. Yes, I know there are vehicles that use rocket-propulsion. However they are few and far between, and are edge cases that I'm not interested in supporting. Leave experiments with flaming thrusters to rocket mods I say.