Require Issue Due Date is a plugin to require setting due dates on issues.
Follow the Redmine plugin installation steps at: www.redmine.org/wiki/redmine/Plugins
Restart your Redmine web servers (e.g. mongrel, thin, mod_rails)
It will automatically make Issue due dates required.
Run rake require_issue_due_date:update_blank_due_dates DUE_DATE=2010-12-31 to do a bulk update of your Issue due dates.
This plugin is licensed under the GNU GPL v2. See COPYRIGHT.txt and GPL.txt for details.
If you need help you can contact the maintainer at the Bug Tracker. The bug tracker is located at projects.littlestreamsoftware.com