Usage of having multiple moderators to 1 row?

[jonathan-bird]

Is there a way to have more than one moderator per model row?

As far as I can tell, it's more of a boolean of approved/declined etc for a row, without the ability to set, say, 5 users who are required to approve it in a tree format so user 5 approves, then user 4 if user 5 approves, then user 3 once 4 approves, and so on.