Make Antitheft hard reset safe (root)

Hey guys,
i installed Antiftheft on my Galaxy S3. When skipping through the settings i noticed one option particularly.
“Make Anti Theft hard reset safe”.

Sounds nice, but before i do this, i’d like to know how to undo this, if (for some reason) i have to remove anti theft again.

After making AT hard reset safe, will it still be possible to remove AT via Avast mobile security->anti-theft->remove avast anti theft?

Has anybody tried this?