NPC team tool

It would be nice to have a tool which would create two teams with.
What I had in mind was something like this:
You have two groups of combines, make one of them blue and the other one red. Then you choose that they become hostile.
NPC’s of the same team would be friendly towards each other even if they are from a different type.

This would revolutionize NPC wars in Gmod, because properly balanced fights are hard to create.