Prevent export of private keys?

I miss a setting to prevent (accidental) exports of private keys stored in 1Password. It is a bit too easy right now to export private keys, which allows users to take confidential information and store it in the wrong place.

The use-case here is to prevent a user, perhaps an uneducated user who does not have experience with life cycles of private keys, from exporting a secret, rather than to prevent a knowledgable attacker with physical access to a computer with 1Password in an unlocked state.

For example, a setting which prevents the GUI from showing the private key would fulfil my need.