It would be a really nice feature to have the ability to gain match an entire performance bank to another one.
It goes without saying that if you switch guitars and then change the performance the user will most definitely have to change the volume of the profiler at that moment.
I think programming a script that takes all slots and adjusts the volume in lock step up or down could be done rather easily.
This could really benefit the FOH when changing banks of Performances in keeping levels under control at the console, remember they get a static feed of a fixed decibel range if your doing it right.
You can use different Input section presets for each guitar for this.
This is basically what distortion sense is made for.