We are working on a setlist support that will work well And be on top of the current GP workflow.
Some players have a “pallet” of sounds that They use while playing live. This works perfectly well with the current GP state.
To have it work with a setlist support we need to do exactly what has been suggested here. Create pointers to rackspaces/variations as “song parts” easily accessible with foot or any other controllers.
There are many other considerations, some advanced functions we are planning, but it’s coming 
Stay tuned. We continue to improve every day.