No, not really what I was after..
In short, submixes are handy on the main L and R outs; it sure would be nice to use submixes on the aux outs for the same reason.
I know, modern problems heh!
I want to send a copy of the submixes to the monitors.
IE for the mains now, I have a nice tidy setup: Once we balance up the submix parts (5 vocalists in one sub, the instruments in another submix, and the drums in a third) then the front of house mix only needs to tweak three faders: Vocals, Instruments, Drums (OK, master and effects as well)..
It would be nice to have the same feature for each of the monitor mixes. IE one fader for instruments, one for drums, one for vocals,
and then I would add my own stuff on top of those three faders to make it a little easier to hear my own guitar and voice a bit above the whole band mix.
I can do it without the submixes, I just have to mess with up to 20 channels per aux monitor send.