RT-3.6: prevent closing a ticket if it still has open reminders

Before I go inventing my own wheel…

By default, a ticket can be closed even if some of its associated
reminders are not completed. Has anybody modified their RT installation
so that open reminders will keep a ticket open (just like open
"depends-on" tickets do)?

Mark Roedel
Web Programmer / Analyst
LeTourneau University
Longview, Texas USA