First of all: The F-Keys are working in FileManager … I was using a new keyboard which I was not used to and I had to activate those to be usable! I edited all of my postings saying the FileManager was just a viewer … I’m sorry 🙁
Now I could type away everything you suggested and it’s working! Yay! 🙂
The only thing that I now have to do every time I want to actually play, is to configure the gamepad as the emulator is not using the ES settings … but this is way faster than my complicated way until I even got to that part!
Thanks a lot for your help! And maybe this new section is in a new build of Retropie soon, too.