Isn't intended, however could lead to interesting story developments about the lore of a specific planet

They even spawn in mech clusters, is there way to disable these spawning in mechs? They go berserk randomly and destroy their own mech clusters.

I don't think there is a way to disable this from happening, but I'll take a look behind the hood

I would love to see Servitude Mechs as part of the Mechanoid factions as a way to deal with "prisoners", or perhaps their own independent thing. The constant mental breaks could be the human aspect trying to break free from the hivemind's will.

I'll mention that I've had 4 mech hive invasions in my game so far and every time it has been mainly combat laborers and breachers in there.