I've just checked and there are no runway or taxiway lights in daytime during poor viz. I cranked it down to 1/4 mile and still saw nothing. Like you, I'd have thought they'd have shown.
EDIT: I've also checked Aberdeen, East Midlands and Prestwick. Prestwick has them.. neither of the other 2 do so it's not an 'FS9' thing. One for the boss me thinks
EDIT#2.. None at Humberside, Manchester or Stansted either!!