"Borrowing a rig, gives you the having to edit it, take out the things already mentioned."

I usually load the figure whose rig I want to borrow, delete everything I don't need, zero it, memorise it (Important !), and then resave it to the library.

So I make my own dev-rigs and that takes only a few minutes.

But as I said, no harm in making an official one for those who need it.

:-)