Disable extension for all roles

[ipremar]

Hello,
We have some extensions that create diferent buttons in the Navigation Bar (similar to SampleExtensionButtonFolder), and we want that only certain roles see certain buttons. I know I can go to Accounts>{ROLE}>Customization> Features and select the UI items (buttons included) that are visible for that role. But by default the extension is enabled for all roles, is it possible to load an extension disabled by default to all roles?

Thanks in advanced.

Iñigo