I know of a couple of ATOs who absolutely hate testing NVFR.
There's nothing like the student who lands halfway down the runway, takes the rest of the distance to get the flaps up and retrim and then climbs out at Vy+15kts while being unable to see the trees at the end of the runway.
Is it just me or does that really beg the question, if the student has put you 3/4 down the runway landing, raising the flaps and retrimming, then why not take the next taxiway and go back to the start of the runway? Thats your decision, not the students, being you are P1.
Also raises the question, if they are half way down the runway when they land, where was the little voice in their head (since it should be there by now if they're doing a NVFR) or next to them (if the little voice in their head has gone to sleep... it is night after all) "Attitude, Aiming point, Airspeed... Attitude, Aiming point, Airspeed" after all if you're at the same point with the same amount of energy you're going to touchdown at the same point?