Now you can run an engine for hours and it will stil be at about 15ºC. What about making the engine get hotter with time so we have a limit of use? What about making the nozzle go red and turn white when almost broken due to temperature?
EDIT: Another cool feature would be to make all parts inside of the plume heat up too
Somewhat related https://www.simplerockets.com/Feedback/View/JNyOOm/Using-engines-improperly-should-cause-damage-or-have-other-penalties
My suggestion could probably be implemented as part of this - engines having an optimal temperature at which they should be to run, and/or at which they need to be to start up could solve my abuse - you can’t go starting an engine up repeatedly because it’ll heat soak and not be able to start.