Here is an example of say setting up the Spacebar for a custom key with the custom keyname of "space"
(make sure you are starting a fresh new game when testing too)
it does not work, so, I can go into the option in game and rebind the keys to whatever I want and the custom keys appear however, it doesn't seem that it lets me actually change any of the keyboard controls in the plugin parameters itself, there's a possibility that my project in bugged so I'm going make a new project and transfer everything and see if it works then