Yes you are right I really need to improve the documentation. Let me take a stab at it here though. Now that said, may I ask what you mean by you are playing RO but not using RO engines? The RO mod itself includes the configs for those engines, so are you removing them and replacing them with something else? Or did you mean to say you are only using the Stock engines as configured by RO into real engines? In the latter case the included TestFlight configs cover several of the Stock RO engine