That's why I said I have never dealt with them.
The GTP thing was just to lighten the mood, and if what you say is true then wow. I've actually never seen a Gonyosoma first hand, but yea rat snakes can differ so much it's not even funny. I've mostly kept North American rat snakes more specifically Texas rat snakes more commonly than other rat snakes. They do climb sometimes but I can say that they've never been perched all the time like you say the Gonyosoma species are. Again I have no experience with them I was just giving advice from my experience with keeping rat snakes because I had 0 experience with that species.