Late response, but better late then never right?
I don’t have much experience with wireframes yet, but I still wonder if this can be solved with a plugin. I’ll have a look see later this week and see what I can come up with. Shouldn’t be too difficult to generate a random number in Java and then assigning that to a newly created element.
This is of course assuming that I can somehow detect the creation of said new element, that’s what I’ll have to look into.