Runes are nice for the caster, even if they are a little underpowered. Thieves should get a way to construct and set traps. Bear traps that are set around in the world can't even be picked up and placed. Not that it would matter since they do little damage, but if they had a hold in place effect even if only for a second or two they would become useful. Just a thought. What do you think?
I agree that physical traps would be a nice addition. I am not sure of the game play aspect as setting mines in Fallout was not that successful for me.