Hello,
That should be easy to implement, but very useful for the lazy guitarist that just like to play a bit of slide.
regarding the GUI I'd like to choose the open tuning with the browse knob, then maybe click on a button for each string or full automatic mode ( string recognition and tuning )
Open G
open C
open D
...
thanks you Mr kemper 
PS : we also need a metronome ( a funky one 
) or a minimalistic editable drumbox that would be so cool