I use one.
Some of the keys dont work
Ive downloaded the source and see if there is anything I can do.
In the mean time I believe you advised someone about getting defender to work.
On the desktop I can press F3 and this is configured as the system reset button so defender reloads out of config mode.
You mentioned that you can copy a .cfg file for the game.
Unfortunately the versions of Mame I run on my desktop use .ini files (which are easy to reonfigure) I can't find any .cfg files to copy across
What version do you use?