We'd like to be able to set the status of a case manually when sending a mail - for example, manually select "needs info" while sending the mail. At the moment, this seems to require two steps: send the mail, then "resolve" the case setting it to "needs info". Is it possible to add the status field to the message fields?.
EDIT: I've tried to implement this with a custom plugin, but it looks like IPluginBugDisplay.BugDisplayEditLeft and ...Top are not called when composing a mail message unless you use the "Send Email" link to create a new case. I suspect there's a reason behind this...?