I've tried it with S.m.fuscus...It didn't work and i had to split them up again. They would allways fight when they came in contact with each other. I also had one that seemed as if it was actively looking for the others.......it was nothing to do with a social visit!
Probably the same reason Desert Haries are so hard to breed. No one can make a set up like they would have in the wild. So, they can not burrow as deep as they want to reach the humidity level that they want.