Customizing Lights and Shadows

Is there any way to further customize lights and shadows using scripting or something? When I shine a spot or point light on something, the light decays from the center. Turning off attentuation helps, but there is still a gradation. Is there any way to make spot and point lights have absolutely no decay at all?

Also, is there a way to give color to cast shadows?

Getting rid of the diffuse can be handled through the use of a light cookie.

As for the shadows, I wish Unity Tech would allow us more access to the shadow properties. Although, it may be possible to write your own shadow system through shaders (would require an extensive amount of shader knowledge).

Here’s my page about how UT should handle shadow color.

http://forum.unity3d.com/viewtopic.php?t=44969

Cookies only allow me to mask the edge of lights. There is still a gradation from the center out. Is there any way to eliminate this gradation so that there is no decay?