i would secound and also third me for this 
very often i get cleaner and also faster results, with many vray arealights, using the save with irradiance map option.
and this one still is missing in the standartlights that use vray shadows..
would be very nice.
Tom
Well I will certainly second this Tom, it would be very useful for speeding up testing interior light solutions. I think it could only be made to work with VRay shadows where the ‘area shadow box’ is checked though because I don’t think point lights can be stored in an irradience map.
Dan