It would be nice if we could customize the template used to generate the email alerts. Subject and changes to the footer of the message come to mind. It would be great if PagerDuty would pickup variables from the email that it received and forward those in to the template. For example the alert that PagerDuty receives would have something like this:

VARIABLENAME: value
HOSTSTATUS: down

and these variable could then be used in the template emails somewhere.