Don't you hate it when you have too much fuel/oxidizer laying around?  Which you could change the mixture ratio that your engines use (like the J-2 did in real life)?  Want no more.  Introducing: EMRController With this mod, you can configure your engines to use different oxidizer/fuel mixtures, and have the ISP and thrust adjust accordingly.  You can even set up your engine to run in "Closed Loop" mode, emptying your tanks at the end of a burn. This mod does not contain any configurat