You can write custom shaders.
What can you make different if you were to write your own shaders thing? Would you be able to sort of make the sun closer/farther away (making the shadows longer/shorter but in the same area)?
That makes no sense. You mean adjust the sun elevation with the environment control GUI?
I don't think you can do that, you can only adjust the length of shadows with the time of day meaning the shadows can only be very long when the sun is close to setting, where as I was thinking with custom shaders you could be able to control how shadows get longer and shorter, I thought this was something fixed in with the daytime cycle/current shaders.
I'm not sure I understand what a custom shader would actually be.