I have this issue.
When hosting a game in MOD PIT on alteriwnet (since you can only host mods in MOD PIT) it will always create 2 teams even setting FFA with my host tool, and in the code ui_Gametype is set also to ffa.
This is quite irritating since you know where your (team-mates) here enemies are.
The most funny is that it is actually a free for all, you can clearly hear it at the beginning of the round but still two teams are being made.
An alternative would be to be able to take out the names on top of your mates heads but I couldn't find the way.