Release : 3.7
Component : IM Reporting / Admin / Configuration
Not without an ER. Right now, Common properties is anything seen on all items, and the other variables are event type specific properties.
It would be new functionality to support additional properties.
You could use the script ability to somehow read the Location off the device itemid and then construct your own email and use email client. We don't do anything other than what is in the notification UI wizard.