User Role Alteration/Addition Request

I am contemplating installing PP at a company-wide level, but I think that its user roles are centered around departmental level installations at the moment. What I would be interested to see is another role added that has all of the project management capabilities of the current Admin account, except that the site configuration options are not available. This would allow me to administer the site, and give department heads management roles so that they could create projects and add new users for their departments without giving them the ability to make site configuration changes. At the same time it would be nice for any of the owner company's employees to be able to create projects and assign tasks to other people. I am not sure if that is a different request though. Someone else has posted a feature request to create client admins who would be able to add users for clients, which I think would work well to help move PP to an enterprise level project management system.