It may sound ridiculous but what I really wanted on my first R22 solo (and on the little 'into the hover down to the ground' lifts prior) was a dummy sat in the left seat. Same height/bulk/weight as a regular instructor.
The dummy height was to keep the restricted viz real, the dummy weight for obvious reasons and the dummy bulk to retain the restricted elbow movement.
Without such a dummy I had seemingly limitless power, limitless viz and the freedom to do weird things with my left arm all with the sensation of the machine being tilted by 30 degrees.
Without the instructor/dummy a lot more light reflected from the instrument glass (I was trained to inspect the T's and P's regularly and, because I spent to much time on MS sim, I always wanted to look more inside than outside).
On the vast 30 hours I accrued post solo the feeling never left me and I asked regularly if I could take up a passenger to replace the instructor bulk.
The answer was always a sensible 'NO' from a 30,000 hours man who said 'we expect a period of consolidation'.
He was right of course as he was right in the pre-solo brief which covered most of the above except the psychological angle of not having something in the LHS.
Regards
Cron