Disable 'Create Diff' in Diffusion Web Interface

Is it possible to disable the ability to add reviews to Diffusion via the web interface ? I would like to remove the ‘+ Create Diff’ functionality so that users are forced to use ‘arc diff’. It is acceptable if it still remains enabled for REST (I assume it probably needs to be so that arc can work).

The rationale for this is to ensure proper file context and lint checks have been run.

There is no setting to disable this.

You might be able to write a Herald rule: Differential Diffs, Global, When [ Content Source ][ is ][ web ], [ Block diff with message ][ … ]. This may or may not work.