Some small things you're overlooking.
#1 Skaarj Berserkers are not buddies of anything.
#2 A skaarj trooper without a weapon is thanks to a weird part in the script considered a player until it finds a weapon
#3 on default UT will remove unreal weapons causing skaarj with default settings on to be unarmed.
#4 Skaarj Troopers are thereby considered players and thus hate eachother.

Some small things you're overlooking.
#1 Skaarj Berserkers are not buddies of anything.

>No, they only hate pupae. They ignore other monsters but default to the skaarj AI when bumped or attacked by some other monster and then they begin fighting.

#2 A skaarj trooper without a weapon is thanks to a weird part in the script considered a player until it finds a weapon

>It's because they spawn with a (default) dispersion pistol. I'd guess that maps without them cause the bugs. I'll test that later, now I'm curious.

#3 on default UT will remove unreal weapons causing skaarj with default settings on to be unarmed.

>Probably what's going on in #2.

#4 Skaarj Troopers are thereby considered players and thus hate eachother.

>They can't spawn as anything but scriptedpawn.

One way is to, when making the map, use the FOLLOWER classes from the Operation: Na Pali mod, and set the variable Bisevil in properties to TRUE, then you can have Skaarj, Mercenaries, and (LOL) Nali fighting TOGETHER against the player. Only works for these classes, and the scriptedhumans, though

Mira que seras qweon las eas que te suceden a vo nomas pu loco