Contact technical support with this - there are some custom patches which can be used to enable/disable the Nav bar buttons.
To get rid of the settings on the pull down menu have a look at the Enterprise home screen XML config - try disabling quick settings.
Alternatively MX can be used to restrict access to the pull down menu - UIManager: disable quick settings.
You can generate XML for distribution with an MDM using StageNow or create a barcode which can be scanned with the StageNow agent. Lots of great documentation here!