Hmm... This seems to work fine, but is rather a clumsy solution. Illuminated windows create randomized lighting at some windows (giving the impression of activity within homes) which will probably look a little odd if all the windows will glow but only some of them will be illuminated. Random toggle that turns some window lights off 25% of the time at certain hours of the night is important (and script heavy) feature so what’s the point using IW if you won’t be able to see it as intended (all the windows will still glow all the time).
Illuminated windows also add more windows to buildings and houses to liven certain areas (such as Ravenrock) so the new windows added by IW will be only illuminated and not glowed at all.
That's right, I just tested this today.
By the way here are other screens from some cities
http://img718.imageshack.us/img718/7448/37426183.png
http://img155.imageshack.us/img155/1493/38147549.png
http://img135.imageshack.us/img135/4641/25204043.png
http://img692.imageshack.us/img692/7914/53827114.png
http://img443.imageshack.us/img443/5305/10244756.png
http://img692.imageshack.us/img692/5563/94400769.png
http://img233.imageshack.us/img233/3408/54888092.png
http://img141.imageshack.us/img141/5808/36136969.png
http://img814.imageshack.us/img814/966/75425484.png
http://img401.imageshack.us/img401/2663/62120673.png