I would like my users to be able to email out ticket system and flag the email as High Priority by pressing the Red exclimation button and then the ticket system will change the ticket priority to a certain status like Critical.

I have it seup using a workflow that if they add the word Critical to the subject line it will do this but would much rather have them be able to click that button like they are used to in email.  

I think this would make the most sense for my users.