Here is an example screenshot showing the problem:
I’ve had a quick look through the code. It looks like those user actions are added around here in a ReviewableQueuedPost class method, where the class extends Reviewable that provides delete_user_actions().
Labels come from here, and we already have labels for reject_and_suspend that are used in the ReviewablePost class for example (which also extends Reviewable).
I don’t know Rails very well, but I get the impression that it would not be much work to add a “Reject and Suspend user” right on that page between “Approve Post” and “Delete User”.
This option would help prevent us from occasionally causing a user to have a bad day.