Ron, The suggestions you have received so a seem to be the only ones around. I've been fighting with the problem since we built our home forty years ago and found out changing pictures/wall decorations is an almost seasonal thing with some women.
No matter what method you use, when the molly is gone the hole will be bigger than needed to install originally. So here is what I have come up with to fill holes in the most secure method.
I have a variety of countersinks and step drills that I use to enlarge the hole on the surface of the drywall and cut the paper cleanly. I use this same way of filling holes on wood, it is very difficult to fill a nail hole at times and I use a countersink to create a nice clean smooth hole to fill. No need to sand before filling and minimal sanding after filling.
