So I'm going to be playing a 3 player game of Space Hulk - or at least trying to

Does anyone have any ideas/suggestions for alterations to manage this? We're going to do one of the missions with two squads (1 player per squad) which instantly makes things simpler - how do people feel about both players sharing the same timer though?

note; this is a group of friends so hopefully any changes which require people to not be idiots will work ok