The thing with manufactured weapons makes perfect sense depending on how it's worded. You can mix manufactured and natural as you wish, but you can't use that appendage if it's occupied: that is, you can't use a claw attack if you're using that hand to hold a sword. I forget where this is stated but I'm fairly confident that that's an explicit rule. I guess it could cause some issues if they worded it badly and using braid blades stopped you using hands or you could use a mouthpick and a bite at the same time though.