Actually, I'm a little bemused by the question:
This was getting rechecked out in an SEP that was 20 minutes out of its 50 h service, flying at a non-ATC airfield, no one else in the circuit. After one PFL from the circuit at 1000' and two EFATOs - one at 1200' for a 180° back to the r/way with the benefit of a strongish wind - this was the last one he delivered to me.
To me a PFL is a practice forced landing. It's not done anywhere near a circuit of any kind - the major 'skill' part of a (P)FL is identifying, and putting yourself in a position to land into some field/area where you don't have the usual cues, nor (accurately) know the field elevation; also to ensure you don't loose track of flying the plane while you're doing that.
In these circumstances pulling the mixture, or doing anything that increases the chances of you actually finishing up in said field is a bit silly IMHO.
A 'PFL' into a known airfield is simply a glide approach, presuming you can land off it, not sure it's a big deal. I guess you're adding a bit more risk that you can't go around, but landing engine out shouldn't be much of an issue either.