Redmine

It would be nice an administrator or project manager, control some e-mails rules. This rules could be by example, if user is a reporter only receive e-mail notification for new issues and don't receive e-mails about change logs and work hours on that issue, or if user is a reporter and send a new issue by e-mail only receive one e-mail confirmation. This is because i' m trying to use redmine like a helpdesk system, and i want to give to my clients the capacity of report problems by e-mail to redmine, but i don't want they can see the rest of workflow.