This is interesting, with some very emotive discussion! If anyone cares to consult the CAA syllabus you will find a section under emergencies titled 'air starts', this is the technique of using altitude and attitude to re-start a failed engine with a stationary prop. All quite legit, so the SRG are lacking a bit on this one BEagle!
When I was a 509 instructor the HoT (he was also Standards) took me to one side and asked me how I was teaching this, I gulped and said I was'nt, he smiled in his usual wry manner and said 'ok lets try it'! I was, I admit, a wee bit apprehensive, but I was all for trying something new. We went up to above 5 grand and stopped the engine and the prop and glided for half a minute or so, exploring the characteristics then re-started it with no drama. We did both key start and air start. No throwing the keys in the back seat or dangling out the window, that is plain stupid and silly.
I was converted after this, and it is a valuable lesson to teach that an engine can be restarted even when the prop has stopped, and it shows how the aircraft can still be handled normally if the prop is stationary, and in this we prove the glide after a catistrophic engine failure.
There we have it, all legal and proper!