how to force all new users to defualt watch state 'checked'


Well-known member
for the same reason as the vb 'subscribe without email'. this seems to be disabled by default and as a result most users miss out on this great functionality.
how can i enable this by default? i see i can do it via the template, but the it will always end up checked, meaning in will 'recheck' itsself when users revisit their preferences page....

in short, how to make this opt-out rather than opt-in?