RCS mode for main engines

[FlazeTheDragon]

So heres the thing, the stock rcs engines are way to small for big ships.

Would be really handy if we had an additional toggle for every main engine to switch it to work as an rcs thruster, that way, we could have much bigger and more powerful dedicated rcs engines on the craft instead of having to stack like 100 small rcs thrusters that look dumb.

[Nuke]

ideally they would use the same part module, you could toggle rcs, engine, both, external (action groups, scripting, kal-1k, or something else). obviously this would not work for thruster quads so they would either have that not an option or it would just use the rear facing engines (which could be useful for changing frontness, or virtual gimbals).