I have used real hide glue for years building stringed instruments where it's a tradition. I really don't want to be a naysayer, so I'll just say hot hide glues is a pain in the ass to use and I'm not sure it would work any better than yellow glue in most applications. It sets up from liquid to gel very fast but unless there is a large contact area between the two parts has very little strength until it solidifies which is no faster than yellow glue. For example, when stick building a frame it will not work like super glue. The closest thing I can think of as far as similar properties is ambroid glue.