Better MIDI export (For Guitar and Bass)

I really like the current MIDI export, but I think it could be improved.

What I'd like is complete guitar chords instead of triads of Piano chords

So Instead of this :

Get this :


Another example on the E :

We get this :

Where it should be this on guitar :

Same for the bass, get a standard 4 string bass arrangement (I have to transpose -12 or -24  semitone everytime)

P.S : also give a name to the track (= Piano/Piano Bass Clef/Bass/Guitar...)