4760… I think the items are restricted to what you can add like potions only taking spells.
I don’t know how the walking animations work in NWN2 but have used an animation programme for a cartoon I made so it might be similar. That had all the “bones” separately named and each one had it’s own line in the time line so if you moved that bone at a certain time it made an animation which would affect whatever it’s attached to ( other bones, outline etc. ) but nothing else.
So this could mean that if the zombie has a different skeleton with different named bones in the zombie walk animation unless you change the names of an npc’s bones or the PC they wont move. In which case the zombie walk might be overriding the normal walk and when it finds the bones it’s looking for it does the shuffle otherwise nothing happens and it’s business as usual.
If this is the case it would make adding it to a human PC very difficult unless you renamed all the bones to zombie ones for humans in the override folder for appearance/ skeleton/ whatever it is. Because the zombie walk can be added to an npc skin it just doesn’t work.
It’s all a bit complicated and way above my understanding, I just thought it would be nice to have “normal” looking ( fresh ) zombies coming at you. Not literally, zombies coming at you can never look nice !