I'm wondering if I can use this hook
http://www.gravityhelp.com/documentation/page/Gform_notification_email
to simply set some sort of flag that GF would use to change how the routing rules are applied. I just want email to go to the address associated with the first rule that matches in the list of routing rules. I understand that I can use this hook to modify the email routing programmatically, I just would like to maintain the 50+ routes in the GF interface rather than to have to hide them all within the PHP code for this hook. For non-technical administrators, it would be easy for them to modify an address or add a route rule without having to edit PHP code.