The feature you were requesting has now been added to VTM31 V1.1.6r2 (beta). The new “Control of Switch mode” mode-select option is called “Remote Only With Bindings” and allows the local switch on/off to be disabled even though any bindings associated with the paddle toggle are still actuated. This is in addition to the existing “Remote only” option.
I tested the beta version a couple of days ago and it seems to work as advertised.