I for one really don't like nighttime. It's just silly to be flying around in VFR dayfighters, dogfighting at night.
What would be cool is if the nighttime effect blacked out icons as well. Then add some nightfighter version of the Mossie and 110 and allow these to see icons in their forward quarter within a certain distance. Setup some spotlights coming up from the cities, that searched for enemy bombers. Now that would make for an interesting night environment.