I think this is covered ground. You're the only one asking to replace the gallery system outright - which is a bit like asking Toyota to make their cars a little more like GM's. Today is the first time I've seen this numismundo.com page (just a collection of links?) and zeno.ru (which does look more like online coin gallery) but in either case imagine how their owners would feel if you were to ask them to scrap what they have and replace with a system more like someone else's.
I'll repeat the earlier challenge - prepare a Tantalus gallery demo and one with someone else's and compare the two. Post a link here. Show in specific terms how that other gallery is better and maybe we can start brainstorming to make what we already have better. I'll be receptive, especially if there is more than just one voice asking for the changes.