I think the "Mode" problem is an engineering one, and not because Mesa has never wanted to.
Be nigh unto impossible to put all 3 modes from Channel 3 on 3 different channels,
because the different channels are about gain-staging while the Modes are about the
tonestack. All the Modes on Channel 3 share the max gain-staging/stacking.
I've personally never had a beef about the modes not being footswithcable, because
I don't need 3 flavors of high gain accessible with a FS.