Android MIDI mapping

The app works fine on a HP TouchPad running CyanogenMod 11, Android 4.4.4.

Like a few other people, I would like support for a different MIDI controller, even just for a few basic functions like cue, stop and fader. Instead of asking you to include mapping for every controller, would you consider a mechanism that allows users to map their own controllers?

Is this possible now, can I find the MIDI mapping file and change the values manually?

Thanks for a good app that allows for very portable playing.