Redmine

I want to use Redmine as a helpdesk-style ticketing system. In order to do this, I'd like to create a role for customers that allows them to add issues (this is possible using Redmine at time of writing), and to be able to view and comment on ONLY the issues they have added (this is not possible using Redmine at time of writing, as far as I can tell).

If whoever reviews this bug thinks that this is something that ought to be handled by a plugin instead, or knows of such a plugin, please add a comment to this issue stating as much, so that I'll be able to proceed accordingly! Thanks :)