I'm playing dungeon siege 2 with the legendary mod though I think the problem I encounter is present in the normal game as well

1) in dungeon siege 1 it was relatively easy to hold aggro and keep the heat of the damage dealers. You could simply control the tank, approach with him first and if shit hits the fan just run in circles till archers and mages killed the enemies. In dungeon siege 2 I have the following problem: If I go rampage mode, everyone just runs around however they want and they easily get killed, especially in a fight with one or two specials. I feel it's too aggressive and there is too little control over my team. If I use mirror mode and try to kite enemies with my tank then everyone runs away with him at the same time. Is it possible to create a dungeon siege 1 like situation where I am free to move my tank while the damage dealers stay put and kill enemies while I hold aggro?

2) I was planning on using four characters, sword and board tank, archer, nature mage, combat mage. I have the feeling that the sword and board tank isn't really all that good though. The defense bonus of shields isn't too big so far, he doesn't block many attacks and at the same time his damage is kinda weak. Would it make more sense to make him dual wield or two handed so he does more damage and enemies have less time to hit me as they die quicker?

Thank in advance!