[Answer]-Admin privileges from google apps user

There is no way to determine if a user is a delegated admin and has rights to create / update / read / delete users short of trying these operations. Obviously if user_feed.login.admin is true then the user is a super admin and has all of these rights.

I’d suggest you simply design your application to catch errors that occur when non-privileged users attempt these operations and display an error explaining what rights need to be granted to the user to proceed.