So it has come to my attention that many people would like spy quests. I find it to be a pretty neat idea. I don't know what rewards would look like; I'll leave that up to the devs. Devs might go through with it, they might not. Oh well I just thought it would be pretty cool to add a new feature!
People have been asking for spy quest since early 2010. So just go ahead and take that idea put it back in your pocket and slowly walk backwards out of the room