In the various reports I've read from pilots testing how well or how poorly they could land with S.V. there was one IMO very useful suggestion.
One pilot suggested that a synthetic glide path VASI or other glide-path LIGHTS showing in the SV view would be helpful.
Seems to me, that compared to the complexity of programming the rest of the adding that at the runway end of the view should be a relatively minor development task with a significant addition to utility.
Alex