Firstly Beagle and Whopity where is it written that you agree that all landings should be full flap, a C150 or C172, why would you need forty degrees of flap at say EGNX, that might just just delay vacation of the active runway.
Regarding solo stalling, I say with forty degrees of flap, I would not be happy with allowing that, unless the student was well trained in spin recovery.
I appeciate you might think 'duty of care' is wrong, but in the event I need to demonstrate to a judge who has no knowledge of flying, it is important to demonstrate that there was a duty of care, hence I will not loose my home. I say that as someone who has rights in the High Court as an advocate.
it would be interesting to know what the RAF CFS rules are on solo flight on the Grob 115 during initial trainingg.