Thanks for the replies!

Seems it's quite preferential. On one hand I could use the 5th in some situations. On the other hand, I'll have to drag him around the rest of the time. I love multiboxing but I'm also a very social player, I'm pretty famous on the server from before I started multiboxing and have plenty of level 70's willing to help me out in instances. So 'easier to do instances' won't really matter in my case. xP

Av, yeh, AV rocks upto the number where it doesnt matter if you have more shamans or not, you will at some point one shot everyone anyhow. So after that, the more will just make it worse.

Hmm, okay, so 6 is overkill, I didn't quite feel like even trying that anyhow. Oo
The only positive side about that is making cool light shows. But that's not why I multibox. xP

I could go 5, I'll have one male and four female tauren shaman. There is possibility for arena trickery there. Which might be interesting to explore. I've often used trick tactics in arena before. Retridin equipping healing shield+mace at first trying to draw attention, me being enhancement that worked quite nice upto 1800+ rating. (if the retridin is focused, chances of succes would go up immensly.) Stuff like that, obviously doesn't work multiple times against the same teams though, but made a lot of fights easy for us. If I have four female and one male, I could have the male 'pose' as my main character, while really be maining from one of the females. Enter arena witht he male running in front, but swapping to a female without moving. Having the male walk back just prior to battle. So the male draws the attention, and I'll have less risk of my actual main being killed first if a char dies. (Thus improving my chances as I won't waste time swapping mains.) But, in a way, I can do that as well without the male. It's just that male taurens are more easily clickable. And also more easily chooseable for opposite parties. Which will also make it easier for my healer, since he can be ready to heal the male asap, as the most likely target to be focused.

So, there might be potential there I suppose. *ponders*

But battlegrounds might be (apart from AV) slightly harder, due to having a rather large portion of the raid in one spot. While really needing to be in many places. (And everyone knows, when you walk around wsg with 4 or more players. The freaking whole raid on your side seems to be following you just to watch! Argh! xD )
I really don't think I want to grind bg's that much to do that in rotations. I want to get the gear asap, then play more casually. But if I want the 5th in rotation for arena, I'll need to gear him in bg's too. That's the biggest downside I can think off.

The descisive factor would be wether or not it's worth doing all the extra work for, just to do the arena trickery. I don't really want to swap out a female shaman either. Those four belong together. xP