My first thought with optimizing the elevators was to optimize where the elevator went when it was empty. Surely sticking around at the top floor decreases avg wait times, no? I feel like I've been in buildings where the elevator returned to the lobby after use (but perhaps there was always another person waiting...)
I agree, I have been in a lot of buildings where the elevators have extremely poor performance due to this. It can be 4AM but they are all configured to rest on one floor or something like that.
