Currently live mixing with groups is near impossible for broadcast purposes. It requires two clicks to add each fader to a group. Should you need to ungroup a fader because that individual signal suddenly increases or decreases, you need two clicks to ungroup, then set the fader, then another two clicks to add back.

I propose that - at least in the fancy skin - the 4 groups be immediately assignable with a row of 4 narrow buttons that instantly group or ungroup.

For the compact skin there isn't the space, but the compact skin isn't practical for live broadcast mixing anyway, unless you really have a lot of clients and no choice.