thanks dude, that's awesome. Its really great how active you are on shader forge. It helps make it an awesome tool.
Did you get a chance to consider my other sky related problem? http://shaderforge.userecho.com/topic/712382-sky-shader-unity-501/

i upgraded from unity 5.0.0 to 5.0.1 and my shader doesn't work at all now :( Just comes out as a solid colour in a sky box. It works on a sphere. Any ideas?

I don't think skybox works as an ambient source at all yet - if it does i found it buggy. If you change the source to gradient or colour it will affect SF shaders now.