RTO
Your post said ( in relation to engine cuts on Take off ) quote The mixture cut is OK for a fairly switched on student and adds a touch of realism IMO unquote. Based on that statement I concluded you believe it is OK to cut the mixture thereby causing a total engine failure while the aircraft is very close to the ground at or only slightly above VMC, and almost certainly below blueline.
Yes I guess a smoking hole right next to the runway would add a " touch of realism " ....