Lighting update PLEASE

I know this is a big one, but it would really help a lot. Have the light levels actally change as you get farther from a light source (including the daylight), and make the light sources actually give off light. Torches and Glowstone just look ugly when they don't give off light, unfortunately. Also, instead of having mobs spawn only at night, have them spawn randomly at or below a certain light level. You could also give plants a minimum light level to grow, and dirt blocks a minimum light level to grow grass.