If I add an item to the Main Menu in the control panel how can I make this layout visible to all users?
I am at the point where I will no longer design an EE site without Zoo Flexible Admin. I can make the control panel much more client friendly and self explanatory with Zoo Flexible Admin. And it’s great even just for me as an admin. I’m not sure how I got along without it before!
It lets you build a completely custom menu set in the Control Panel. And you have have different menu sets for different levels of users. It's really great.
This addon may help you. http://devot-ee.com/add-ons/cp-default-tabs
In the past I have done this by manually updating a column in the members database table.