How to disable user for disk encryption unlock

When I add an account that user is added to the list of enabled users when first booting a disk protected with Filevault2. I only want the master password to unlock disk encryption. I don't want to list admin or standard accounts. Is this possible?

This sounds like two different questions:
1. I only want the master password to unlock disk encryption.
This isn't possible to my knowledge.
2. I don't want the EFI bootloader to list all accounts upon first powering up the machine
Despite many customers' pleas, Apple has not changed the 'list all usernames' feature on first boot... however, waking from sleep, logging out or fast user switching to honor this request (when set in System Preferences).  There are several discussion forums previously attempting to solve this issue, but no concrete solution yet.

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