Additional Computer Players for an AoS Map?

[iron_warrior]

I'm making an AoS-style map, and, natually, I want to have as many possible players per side; 6 Versus 6. However, due to the condition on which Warcraft 3 sits, it's not possible to create additional computer players and put them on Forces.

Or is it? Th'other day I was playing Tides of Blood, and I noticed that it has 6 a side. I suppose somehow they use Neutral Passive and Neutral Hostile, but wouldn't that making a ton of complications like the fact they retreat? If that is the way to do it, could someone point me in the best way to ally them with each force?

Thanks in advance,
iron_warrior.