About night, we could have added some lights that might lightened up the passengers (only in P3D4) but the issue is, the dynamic light system doesn't have an "occlusion" system so, if we did that, the light that is supposed to be contained in the jetway internal, would spill on the apron, since the jetway floor cannot act as an occluder. We could have a night texture, but then passengers will still be dark.
Yes, the ability to separate passenger and crew boarding has been asked many times, and we have already confirmed to be looking into it.