just became my arduboy… and first thing I tested, as a big fan of the ( retired ) Arduino Leonardo, was the Keyboard function of the 32U4. Use the “Buttons” Sketch from the demo zone and add Keyboard.begin();
in setup routine
and add Keyboard.println("<name of key>");
to every Key read in loop
Then test in a VIM and also on another Textediting Program. It wrote the words… but the newline (return) is missing. The result looks more like a 5*“foobar” in e.g. Python.