Great idea, but only the sq-leader should have that option.
There's just 1 issue why SS probably wont consider it.
When you are doing whites or sm and you sq-leader adds a player to the team the mission-strategy wont allow it. The mission (white or sm) will fail and you will have to orb in order to activate the mission again.
This needs a lot of (re)programming i think.
Maybe SS will grant this option when you're just grinding for e, bps or lvln; but then what's the point in making sq. The cr will be divided between sq-members; lvln has no effect on sq; xp wont be divided between sq-members.
Cheerz