I agree that this idea seems to have decent support - it certainly has my support. But, I thought I would toss in one more use case. It's a very specific example, but I am sure that others have similar examples, and it's just one example supporting an idea that probably has a wide range of applications.
On our AV plans, when we call out an enlarged room plan, we like to identify the AV system in the room. The project could have, for example, 6 architecturally similar conference rooms, 3 of which are set up with an AV system for teleconferencing, and the other three as "presentation" or some other AV scope. So, we would have two enlarged plans (one for each type of AV system) and have some additional callouts that reference those views (SIM). That we can, and do, accomplish easily. But, it's hugely valuable to us, and more to the end users reviewing the drawings, if the callouts have an added parameter that can say "TELECONFERENCE" or "PRESENTATION' or whatever - this helps the end users see where the different AV setups are located - without having to keep track of which enlarged plan is which, it helps us to get the callouts placed correctly, and it helps the contractors get to the correct detail sheet more easily.