@drumsticksplint
that sounds like an interesting project.
At the moment I can't read any inputs on the controller via the USB interface. But I just sent a request to Gauthier Brière, the developer of Mega-5X, to see if this is possible in the future. Another possibility would be to use a second USB interface and another Mega or Uno with a small program to send the input status. However, I would like to wait for Gauthier's answer first.
@kmimax
yes, GrblGru is not open source code. But if you have a new translation of a language, I will of course be happy and include it in the next version.
You can simply attach the language file to your post here in the forum.