The advantage of having those switches in the master section is that they'd be *global*, eliminating the need for changing profiles one by one. Also I'm not overly fond of how the cab low and hi shift sound.
While I want those global controls too, realize that any profiles which sounded great before would not sound as good with the global EQs enabled. Best to approach each profile individually and then only use the global EQ to address environmental correction (ie boomy stage or really bright room).