I did my ppl skills test last week and as most students I felt really nervous.
One part I felt really confident with though was stall recoveries and the compulsory pfl.
I believe that this was down to the simple fact that I have spent a lot of time on doing them, both with my instructor and solo.
I can't really see why I shouldn't have been allowed to do stall training as a solo student. I'm sure my instructor wouldn't have authorised me to do them if he wouldn't have had the confidence in my ability to recover in a safe manner.
I believe a good instructor can judge the individual student and make appropriate decisions about what this student is capable of doing or not. By leting a student do things solo that he\she is capable of is very good for confidence, something that can't be bad when it comes to flying.
Doing a lot of stall training, slow flight on the back of the curve etc. at 4000' dual or solo is in my opinion not a bad thing. It made me to understand and appreciate fully what risks we have to be aware of in the takeoff and landing.