I have a 2W Rogue PC, and only one tank... I do have Durance, but I cannot set more than one trap at a time: whenever I put down a new trap, the previous one disappears. You speak of them as plural, so I am guessing that's not an intended balancing feature? Also, can you sneak in combat?? I took the Backstab feat, but it turned out pretty useless thus far, because I can never sneak up to within 2m of any enemy. About Eder tanking: I still don't get whether tanking even works in this game. Even with maxed out Engagement, the enemies often just ignore it, and rush for my mages. I mean, it's the tactically smart thing to do, but I'd like some means of controlling the battle.
Also, if I come back later, will everything remain the same? Because it's kinda silly, plot-wise, if I infiltrate the fortress, then leave and come back a month later to finish off the last boss, still waiting for me. :D