Dynamic group functions

[glare]

Pardon if this already exists, I would love the ability for subgroups for those situations where coordinating a lot of people during events occurs.

Effectively this would result in every member of a group echoing the same group actions as the leader. So if the group leader joins someone else, everyone in her group auto joins them as well.

If she leaves, everyone that was originally following her also leaves.

if this is implemented there are a few more group orientated organisational tools I'd like to see but this is the most basic one in my current train of thought.