A question for those more experiences with IS.

How can I make formations, and then move the toons as a group in the formation?
I know it cannot be via follow, or that would destroy the formation.

Is it just a mapped key, which sends Forward arrow to every toon?
If that is the case, won't the toons vary slightly in their facing, and drift apart as they travel?
Or would I mouse broadcast, and use double click to move them?
And again, will they retain formation, or gradually split up?
I saw the flying V formation and am curious of that too.