I know you can't do it within the conspace, but maybe you can do it during a photoshoot or something that is off-campus, so to speak. I just know you can't walk around the hotel handcuffed to anyone else. Like Nikki said, it will cause snags and impede traffic.
There's nothing in the rules about handcuffs specifically, but I do remember them causing problems when people tried them in the past. If you want to do it though, keep it at the photoshoot.