I would like to keep the old default Zend Router, and just add a router for administration subpages since the controllers are growing in size and I would like to logically separate them a little as well as have cleaner URLs.
The documentation seems to explain how to do other things but not this...
This will work out of the box with the default routes. You just need to add an administration module, and then /administration/users will map to the users controller in the administration module.