For instance a Crestron Pro2. Every time we install one, we have cards to go with it. I think I can speak for everyone when I say that we have a card as an accessory, and when we drop the product to the page we bring the card over too. I just snap the shapes together and go with it.
I am kind of having mixed feelings right now about being able to "turn off" certain i/os. I see the benefit of having an audio distro page and wanting to turn off the video or unused i/os to get them out of the way and make your stencils smaller. But would the extra effort of managing another data entry field be worth the trouble? Not to mention the possibility of compromising a design when you look at your shape to discover that your out of component inputs. JMO