1.6 Candidate 7.
Ok a test:
Set the value to 30, sets the RGB to 30, 30, 30
Uncheck the sRGB box, OK the dialogue.
Open the picker again, the value and RGB are now set to 28 and the sRGB box is checked again. Unchecking the box keeps the value at 28 and the RGB as 2, 2, 2.
If you say this is the way Max carries the colour over, then fine. It just seems a little strange to me that the colour that is set in a corona material cannot be absolute in some way.