Can Irradiance Map be Reset from Command line or Assigned to a button in Rhino

[MvyessSA]

Pretty much as the title says. Is there a way to reset the Irradiance Map from within Rhino easily without going through the Vray Options menus.
It is usefull to leave IR on Incrementally add, but it would be nice to have a quick way to reset the map after a quick change in settings or geometry etc.
Michael VS