Questions on Events - SmarterTools

A few questions on Events

1) Is there a way to provide domain admins access to the 'domain' event category so they could set up their custom domain usage notifications? I can't seem to find any event related settings in the domain defaults.

2) If I was to set up a global server event for a domain space notification at say 90% how to do I define a domain admin variable in the recipient field for the event action?