Hi Dom
I've not had a lot of problems with new divers rapid assending, but then as we use a shotline for assents most of the time, this may well be a factor, in fact i am convinced it is a big factor in our diving safety.
An ideal chance to use my hand above their hand to control their assent on the line, plus an occasional use of their shoulder dump if required (not very often).
Although i try to assend face to face, as their is often a bit of a current running by then i am often above them and i'm quite wide if they want to get around me.
Dive Safe
Paul