Is there a way to disable a user to unlock boot disk FileVault on Lion?

When I enabled File Vault on Lion, I asked every user to type in its password to enable them to unlock the boot disk, later i regreted my decision, I'd prefer to let only a few users to unlock the disk. Is thre a way to revoke this privilege from some users?
I konw I can do this disabling file vault and re-enabling it, but it requires a lot of time.
Thanks.

Ok, I figured it out. It is easy. Go to:
Menu
Settings
Device
Sound
Volume
Then slide the System bar to off.

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