Wait, what? Your DPS should focus on the adds anyway mainly (minus Berserker Stance when you should only deal with shamans and maybe the mages) what good would it bring to drag boss on top of the adds? Bit of cleave or chance for multidotters to dot?was thinking of moving him to where the adds come out so it's easier to kill them.
The risk of accidental healing totem, earthshield on boss or Ravager if you fail at keeping his rage low, in the middle of the raid is not worth it. Just tank the boss where it stands, it'll give you loads of bonus's like:
* time to move from charges
* most probably ravager not on top of raid
* give you time to deal with shamans/totems before they heal boss
* more room to manouver
The only cons I see is that switching to banner could take time, but heck, 1 ranged and tank should be enough to deal with the banners on bad case.