Each user can turn on/off the auto watch functionality on their profile: https://confluence.atlassian.com/display/JIRA/JIRA+5.1+Release+Notes#JIRA5.1ReleaseNotes-autowatch
"If you don't want to automatically become a watcher of an issue you create or comment on, you can disable this feature through your user profile, by choosing Disabled for the Autowatch option when editing the Preferences section of your user profile (see left screenshot)."
Is that what you're looking for, or are you looking for a global way to turn autowatch off for everyone?
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