Probably more choices in case a cultivar is not highly either would be better, but the rating that shows would still be the last person's edit that was accepted by the monitor, so one person's experience. I suppose it may be that others don't change the rating because they agree with it in which case it's more than one opinion, but there's no way of knowing that. I wonder if there could be a way to indicate the history of any changes?
Yes, I've heard of Dr. Ingham before, her talks were discussed on the AHS Robin starting as long as fifteen years ago (just checked) but not in recent years as far as I recall.
One thing that I would recommend, and you probably already know this, is that if you want to try something don't treat all the plants at the same time. If you leave some untreated then it gives a better idea of whether the treatment made a difference.
