And proof? They took the original cutscene with the crashing nautiloid and turned it from day to night. If they can do that, they can rework a day/night cycle.
This is exactly the main reason ...
It would require to take every cutscene and manualy rework it for any amount of light.
The best you can hope for is manual switch between middle of the day and middle of the night, wich would both stay forewer ... even that would require tremendous amount of work, but it would mean least work compared to other posibilities.
I still dont understand why cant we change Race for our hirelings. Lets us play Githyanki as racist as they trully are!