You can use any weapon with the 'cut' attack type to sever the legs of any downed creature, including entities and creatures from other mods. You cannot cut the legs of mechanical races, as I deem this unnecessary. Note that if the creature has no legs, its spine will be cut instead. The speed of part removal depends on your weapon's DPS.
Actually, I have mostly tested vanilla creatures, and they can all be manipulated. I think mod creatures should work too. If they don't, you can try providing feedback in the comments section, and I will periodically work on compatibility.
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