Email subject/body changes and also Update time?

Three questions, I hope it doesn't get too confusing.

One.
Is there a way to change the email subject I would like to put our "safe" word in the subject so that it doesn't get rejected by our spam filters.

Two.
It would also be nice if the alert could be customizable. In other words not only tell us what the event is but add our own input to the body of the email eg lets say you have an alert on a backup server. And the error you get is that the backup drive is off line. Then you would get the alert but also give the answer to the error eg.

Fred, if you get this email check drive G: it sometimes goes off line. Pull it out and push it back in.

Three
I don't understand how often a scan is done. It looks like every 10 or 20 minutes. Is there a way to change this to a longer period of time. eg every hour or couple of hours.

Thanks.