Originally Posted by
Ramsus
I would suggest making the neutrals a little more interesting. Maybe make them make their choice at or before the half-way mark of the game and maybe give each of them only two teams they can join*. This would lessen chances of them all joining the same team. Also it might help you figure out the name for those roles if they're actually different in some way from each other.
*Only do this if there are three or more neutrals, otherwise the mechanics favor a specific team. Basically, be careful about how you implement this idea.