@f-lummoxed good memory, there was an easter egg and it needs two things:
the Preference in the registry* for "candle" has to be turned on you have to hit the 'c' key while the f.lux UI is upIt got turned off during one of our "don't do things that the user can't figure out how to undo" cleanups... but the pref is still there.
HKCU\Software\Michael Herf\flux\Preferences\candle = REG_DWORD(1)