Never mind the legacy, it is mine. My way of enforcing the policy *not* to use that option.
It is reproducible, not using option, but using :
:: Deletes an option by writing it without a value.
:Del_Option [ _Section _Option ]
:: Effective immediately, but only for current session.
:: The option resets to the builtin default value!
:: Effective only after TC/TCC restart, but persistent.
if [EMAIL]%@INIWRITE[%_ININAME,%_Section,%_Option[/EMAIL],] ne 0 (
echoerr "Could not remove option %_Option from section %_Section"