Pally or Warrior for MT

I have just started multi-boxing using software from this site. I had been leveling a shaman single mode to eventually box with my 70th warrior. My intention is to focus a 5 man team on PVE content. I was leaning towards 1 Warrior and 4 shaman. I figured the limited classes would make a transition into boxing a little easier. As I read more it seems that the paladin is the preferred tank for boxing since he handle multi adds better than the warrior.

How much hassle is aggro management 5 boxing with a warrior instead of a pally?
Is it worth it to switch? I intend to use the 70 to help the others level but could just level a pally from scratch.

Thanks for any feedback.