is there a way to change the looks of the light shadow caster?
what i want exactly is to be able to change the color, maybe make it semi-transparent, and add some anti-aliasing to it because it looks kinda pixelated
Also, you should fine-tune the frustum of the light so that it encapsulates only the objects that cast shadow, to make better use of the real estate of the shadow map.
See this sample for more details:
The sample also includes a GLSL shader (which is not required) in case you do want to create a custom shadowing shader.