So I'm wondering about the temple bonuses because I want to play this game with 2 or 3 copies. I thought about using all the treasures (so having three 5 bonuses, three 4's etc.) Wouldn't this still work? I worry about using one 5 bonus for 12 people.
With 12 people, yeah, you might want to have more bonuses on the same level. You might also find a lot more ties for reaching any specific temple, too.