Since it is not possible, in the course of creating a feature, to enter a parameter on the fly? I would like to ask the PTC guys if it would be possible to add this to a future release. (See Modeling Forum).
I guess I'm just used to having it around in UG and thought Pro/E, being a high end CAD player, should have it too. I don't consider it an 'Advanced Feature', I consider it a great piece of the puzzle.
After having used Pro/E for a couple on months now, I love the 'Datums on the Fly' feature, it just seems to be a great way to hide some of the datums that you don't want to be seen. Wildfire is a little different concerning the datums, but the final outcome is the same.