There is a tendency....and i worked towards that goal....to have a compact setup of jam, practice and performance. It goes totally against that idea, to just hook up another device for a metronome.
Something that goes "click" bores the DSP to death and the tap-controls do already have the ability do recognise tempo.
I would see the metronome as a part of the looper, tap or set your tempo, volume dial....done. Sounds simple to me.
Yep, I second that. Could be switched on/off using the "Looper" button on the Remote and the tempo could either be tapped or dialed in using the Rotary switches.
P.S. If that's too boring to implement there's still the wish to make the KPA a class compliant USB audio interface.