Is there a chance that we'll see this sort of thing on a fraction of the planets with life in the future? I've been very impressed with one specific thing while playing the otherwise awfully incomplete and buggy game Legends of Pegasus..
One of the races, an aquatic species, slowly terraforms the planets into ocean worlds with a bioluminescent glow on the night side, essentially somewhat equalizing the day and night side. It looks absolutely incredible, and would be a huge surprise to find in Space Engine as a sort of "super-rare" type of life planet. (obviously more toned down and sparse than in this example)
To be honest this ties in with city lights as well.. I also with there was another super-rare form of life planet, which actually had some signs of civilization, even if it was only in the form of city lights on the night side (or on the day side as well, if orbiting a dim star and real planet brightness is turned on).