How many times have you practiced an advanced nanmu juggle only to fail and restart the training over and over and over and over again? It's tedious, exiting from training only to join back in, just so you can have the nanmu for the juggle and fail again... Do you wan't to have infinite nanmu during training? Since it's probably going to be a little game breaking, you can just put some kind of a cooldown after you use it. Like 2 or 3 second CD before doing it again.
The only downside is that, knowing Nimonix, when this is implemented, there's no doubt going to be some bug that trnsfers that to the real game. Personally, I'd go for a "reset" option that just repositions you and the practice dummy back to the original starting positions, with refreshed Nanmu and Panics. :3 So yeah, Support nonetheless.