We have more roles here than just Assignee and Reporter. When we recieve notifications it would be nice to have that included. We have a custom field that alows people to own issues. Also, if I am just a watcher on an issues it would be helpful to know that as well in the notification. We also have a "lead". Sometimtes it't not always clear why you recieve a notification so to be able to add that would be great. In the past we did with source code modification but we are trying to get away from that.