Trying to do that would be futile, as users can re-set it at any time. Besides which, turning that setting to 'off' for your users is generally undesirable and is likely to incur their opprobrium.
If you have particular documents that you need to prevent field updates on at print time, you'd do better to implement a print macro that locks the fields concerned before printing and unlocks them again afterwards.
Cheers
Paul Edstein
[MS MVP - Word]