Well, it seems to be a personal choice. After reading that same article I wrote Ken Kalisch (editor of Chameleon News) to ask his opinion and/or where I might get more info, as Chad only mentions it in his article. Here is part of his reply to me, and I quote:
"Here is my take on the mixing of different reptiles.. The idea sounds very cool... but the reality is you potentially are exposing them to more environmental problems with the introduction of other reptiles. I would say play it safe and house like types in their own housing set ups." (KK)
I am not sure if it is something I will do, with my stumpi's, but would certainly be interested in reading/hearing anything you may find re: info, experience, etc. I think I would take personal experience over anything else, so please keep me posted!
lele