Well, they say you can use Duct tape for anything - I guess this is just proof of one more thing!
I'm glad to hear your tree rose is doing well - it's been a month since it's little accident, so I would think if you were going to have any negative results, you would have seen them by now.
I would make sure that it gets all the nutrients it needs, and don't let it stress in any way for food or water. Also, the tape could eventually act as a choker, so after some time, you should take the tape off. Not too soon though, wait till that break has regained some strength.
It's great that you were able to save it!!!!