It seems to me that one really valuable thing that some experienced GM's could collaborate on (or share, if they've already created something similar themselves) would be a list of obstacles and encounters, separated by character role that they're tailored to. In theory, Crossfire cards could be used for this if they actually had SR stats/mechanics.
The primary use for such would be when you get blindsided by a set of characters, whether at a pick-up game at a convention, or maybe your regular group decides that campaign pitch you made a month ago sounds better this weekend than something else that was planned, or whoever was going to GM can't make it. Or maybe the player that you were certain was going to play a rigger just shows up with a Mystic Adept instead.
Then you could just look through your "encounter cards" for the roles you're given, and just have to figure out how to herd the group from spotlight to spotlight, until they get to the finale, and everyone gets their moment (hopefully). Even better would be to have notes on how those roles would be most likely to handle the individual obstacle/encounter, and how to modify the challenge level on the fly to keep it interesting.