Going to tag @proofofbrainio on this comment and others for a quicker notification.
Proof of Brain
As you stated, the new POB front end doesn't possess that capability. I am not sure what efforts have been made in this area. However, that such a function must be restored. I'll update you on the status. I expect to receive status within one day, hopefully.
Verify Your Brain
Verify your brain will have the DV function disabled. The option to turn off post and comment rewards will be enabled as reported by @trostparadox.