Monoprop flows across interstages no matter what

@AnotherFireFox I would go with an entire new propellant category for cold gas instead of a power cycle

@pedro16797 RCS is a form of rocket engine with less to none spooling time. The logical solution is making a power cycle for RCS, not separating both. If you wanna do an RCS with slow spooling engine, like Merlin RCS on old Startship, that's your choice.

@sflanker personally I would post this as a suggestion rather than a bug report.

@AnotherFirefox @sflanker there's still the issue of spooling times in classical rocket engines being too slow for a propper rcn, getting rid of them sounds like a really bad idea. An option in the case of wanting to yeet them could be making cold gas a type in the rocket engine part.

@AnotherFireFox that does seem like a reasonable workaround for players wanting more advanced and realistic behavior 👍

Simple and obvious solution which can entail a lot of other positive effects: Get rid of RCS and make all reaction propulsion system RocketEngine