I also see where someone mentioned about switching amp channels in a rig where your amp channels change but the effects stay the same. I can relate to that a lot with on the fly moments in church, where I might want to switch from say a vox and alnico blues to a friedman with a 412, but keep the current effects the same. Then, when I need to have everything change and revert to a specific sound like friedman dry, or deluxe dry with an overdrive etc., then the scene button would be used. That would be mega rad; best of both worlds!
I understand Yek's way of doing it too by using the sam e cabinet for everything, which I have been doing for some time now, but I was thinking in terms of the authenticity of tones from a "purist" point of view if you will. Of course great sounds can be had either way.
It seems something like an option in the amp block to turn on cabinet linking of A to A, B to B, etc would be the easiest. That way it's not FC dependent. Maybe even combining the amp and cab block, which might not even be feasible or too much of a pain in the butt. It could make choosing cabinets and impedance curves quite easy though! Say all of the amp's parameter tabs on the left, and the Cab Parameters across the top. Just typing and thinking out loud haha