Alright, so, first off this is in the Mod Making section because it is not every faction, just my custom faction. I tried to create a faction that will not gib, and can take infinite impulse force before dying (but not getting hurt), and it sorta worked. Arms and legs still break for some reason beyond me, and there is another problem that is only apparent when playing Campaign. When I "leave" a scene, either after defending the site or attacking it successfully, I usually leave somewhat damaged combine behind to use next time. Only problem is, when I come back, they've either taken random, mysterious damage from nowhere or outright been gibbed. This is especially bad with diggers. I tell them to mine gold and then next time I come back to the scene, they've left nothing but a pool of blood (I'm not kidding) where they used to be standing. Any thoughts, help?

I think this may have something to do with either the way the game handles the limitations or joint strength... I would just mess around with it a bit more because if you set somethings too high or too low you get weird results.

It's probably one of the following, though of the two it seems more like the former:
1. The scenewrap bug, where certain parts of the scene gib actors that cross it under certain conditions (it seems to happen a lot when digging).
2. Too many MOIDs, press CTRL+P to see the number of MOs (Movable Objects) currently ingame. If it's over 255 weird things will happen including random gibbing, inability to be hit and a good deal of lag.