Community created and played missions would be awesome. An interesting idea would be running a text based RPG (like zombies and GOD mode) with created missions inserted in to supplement the action.
Wow, I'm glad to see this. Shadowrun is one of my favorite settings to RP in and this game looks pretty sweet. It looks like it almost plays like a normal Pen and Paper RPG would. I will almost definitely pick this up. Plus, I'm a sucker for games that let you design your own/play others' content...