Trouble making NGUI shaders. Bug?

I've been trying to make an NGUI shader and there's a number of issues.
Even if I can get it to render, and I have no idea what I did to get it to do that, I can't get valid UV coordinates because it uses atlassing.

While adding a second set of UV's to the sprites would be on the NGUI guys shoulders, I was wondering what ShaderForge could do to make sure it conforms to NGUI needs.

Because I'm an artist and live outside the code...I really have no idea why SF isn't working.
Anything you could tell me about how the rendering system works, on either side of the pipeline would be useful. 

Any information what so ever would be useful.

-WM