Yeah, it became apparent quickly that an herbivorous civilization would be yet another mechanic that mods are not equipped to handle.
So, I'm not sure what's going on with this, but my Lagomer squad never equipped wooden staffs when going into combat. Fun times, I decided to go straight for the magma, so the first weapons grade metal I dug up was adamantine. At first I thought the wooden staffs were too heavy, but they have no trouble equipping adamantine black bills. In Arena mode, Lagomers had no trouble equipping iron staffs or forest bills, so I don't know what's going on.
The Tuck proved to be a pretty nasty weapon in Arena mode. If it hits, it does gruesome damage. I tested a Vulp with iron Katana against a Lagomer with iron Tuck, both with iron buckler, helm, mail and greaves. The katana started off causing numerous injuries to the Lagomer, including a blow to the hand that severed the nerves and forced her to drop her buckler, while the Tuck never got close to any soft parts on the vulp. For a looooong time neither weapon managed to land any killing or dismembering blows. The Lagomer collapsed from exhaustion a few times while the Vulp fruitlessly slashed at the armor achieving nothing. Then out of nowhere, the Tuck landed a hit to the vulps arm, severing it, and the Vulp bled out before she could strike back.
UPDATE: For fun, I decided to remove the [USE_ANIMAL_PRODUCTS] token and I can't tell any difference. They still fish, hunt, butcher, milk, etc. I think what I will do then is just let them have the same industries as omnivores and see how that goes. This makes me suspect that the carnivore races may have similar problems. Komodos are next, we'll see how it goes.