I have a crestie who is downright chompy sometimes, to the point where we've gone to using gloves to handle her because she's so unpredictable and we're tired of getting bitten. Sure, she can't do any real damage (it's basically like getting pinched), but she knows the difference between skin and leather - she never tries to bite the gloves, so it's just more expedient to wear them. We've never been able to determine what caused the change in her behavior (she's never been hand fed, and never bit for the first 4+ years of her life, and then went aggro on us seemingly at random about 2 years ago), but the situation has left me thinking that anything that could encourage biting should be avoided.
Admittedly, it's a sample size of one, and therefore not statistically relevant, but it has colored my opinion.