I got about 560 hours played (although haven't played in a year) and I strongly suggest you setup an outfit for everybody. I wouldn't make it mandatory but I would very strongly suggest it to everybody. Reason being is you want to coordinate, otherwise people will just get lost and frustrated because they will not really "feel" the connection. Sure you can have the stream open and running at the same time but that's very chaotic, especially since you hear gunfire from the stream that isn't really near you. Reason for the outfit would mainly be coordination. You want to tell all your little minions where to strike next, even just in the most general sense (continent x - strike south or strike base y). Without an outfit everybody will just feel like a random player without a purpose - you'll need to motivate the troops and such to prevent the army from losing cohesion!