The pick conditions will work for any behavior expression as well.
I'd be willing to bet rex has more than one that would work already, or you could make or have one made.
The hard part is knowing how picking works, and how/ when you would label objects.
Edit:
Actually all you would really need to do is put a data type plug into a container with the objects you are creating.
You would then have to fill in the blanks at creation.
xml would work nice, Yanns json might do as well.
You have to define everything you want to do to start.
You can't just start with "whos yer daddy".