Allow preservation of variables in the default list to be disabled

[konsolebox]

If I'm reading the code correctly default variables that are enabled for preservation are specified in the initial_keepenv_table variable in plugins/sudoers/env.c, correct? If possible can preservation of these variables be allowed to be disabled through an option like --no-preserve-env=VAR? I know env -u VAR sudo ... can be a good workaround but better have the capability in sudo itself since it's the one responsible for allowing the default list.