One part of the tutorial dungeon is a 'puzzle' with pressure plates where you learn how to split the party. I haven't tried doing this by placing objects on the plates but this is the first scenario that springs to mind.
There's also a puzzle in cyseal where there are 2 trap doors in different locations that lead to caves that look the same. in the first room you pull levers in the order written in the second room, then an enemy spawns in the second room you need to beat. you then redo this to for the other room. This part could be on a timer to promote splitting up the party.
I can't think of any other missions where it might be required to have 2 people.
Edit:
As for giving the creation stats, maybe try giving player1 the lone wolf, ability and skill point traits when you spawn on the beach, so you don't have to waste a talent points during creation and get a bit of a boosted start to counter the fact that you're on your own.
Last edited by ck06; 31/07/14 12:42 AM.
