The idea is to allow to edit a mapping, either from scratch or to overwrite an existing one, and save it to a different file which would have priority on the old one.
Now I wonder if it's not overkill... I think most people probably have some standard gamepad coming from a console, which is recognized directly, that's this weird adapter which caused trouble here !
So I still wonder if it's not too much to merge the mapping program, it would probably create its own window to create the mapping... I'll think about it...