Though I try not to do a lot of cross forum posting I felt this might be helpful in this new area. On PBjunkie there have been some good discussions on Scenario rules.
Scenario Reffing : Spies - PBjunkie.com Scenario Reffing: Referee - Definition, Types & Associated Responsibilites : - PBjunkie.com Senario Reffing Manual - for Refs by Refs and players alike... - PBjunkie.com
These are not the only threads just a few. I've already told some of the common members between PBJ and MCB about the new area/threads over hear. Maybe they'll join in. There definitely is a wealth of scenario experience [especially from the SE] on PBJ.