Redmine

I'm new to Redmine, so I'll be brief and thank you in advance for your answers.

We are hoping to use Redmine as our project management tool. We'd like clients to be able to submit their issues through the system, but not let them see issues assigned internally. As it currently stands, it looks like any user on any given project can see all of the trackers - provided these are turned on in the project settings.

Also, when I create a new issue as a client, I am able to assign the tracker, status, assignee, start and due dates as well as estimated time. Aside from providing a subject and description and adding files, it is unlikely that we'd want a client to be involved in designating the other fields.

My question is, will Redmine allow us to create a low-level user with limited access to New issues fields and that can view only trackers initiated by the client? Or, has anyone written a module that will effectively;y accomplish this purpose?

With thanks,
Bill