I want to say, no, this is not allowed, but i cannot remember why. in any case, if you were allowed to play the pally and if you want, you can easily take the pally through stocks or sm in either spec. bring a shield, strafe a lot. with the pally there is really not much you can do besides running through the mobs and hoping you get aggro from the rest of the other mobs through association. meaning an unaggroed mob will be aggroed too if they see their friend running after you.

i would go prot, but that's only because i want to run around, grab the whole instance and run back to my alts to kill everything at once. there is no magic sequence either. you're basically going to consecrate +ret aura and auto attack most of the time. in sm:gy, you can use that nifty holy wrath spell, i think. but otherwise its boring old ret aura and consecrate. also remember if you need to bubble, make sure you bubble with your party out of LOS or else the mobs will make a beeline to your boostees. also, if your ret aura kills the mobs before you can get back to your boostees, go with a different aura first, then switch. make a macro to just switch back in case you forget.

good luck.