Thanks for playing and the kind words. The bugreport is very useful. I'm currently looking at the issue with the keybind menu. I hope to move this bug to the "fixed" column soon. https://trello.com/b/8rr6ZIda/peri-june-21-demo-bug-fixes
As with many things, the nade launcher probably will need extra explaining and refining. In real life, the RWGŁ is a blank firing rifle, with grenades placed inside the nozzle. This is how it works in peri as well. The ammo count displayed is the number of blank rounds inside the gun, while an additional reload will place one of the available grenades inside the launcher (they are green round cans in the inventory). The commander gives you less grenades than the gun holds blanks. Hopefully loading in nades will be more obvious when the animation for it is ready.
In case of problem 3: the save file and log file will come in handy to get to the bottom of what happened. If you are using discord, I cordially invite you https://90s.graphics.discord, as this will be the easiest way for you to send the files (and be guided how to find them).