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I also wanted the option to show a Skybox as a Background option (not just a Solid color) :D
Good question.. I saw someone use it to Shrink a gradient, so i started to use it too. :D
https://www.dropbox.com/s/zfkf62itsdhm7gn/HSL_Stri...   :)

Everything work just right in the resulting shader, just bugs me that Dot Product preview wont shows something slightly different. 
im also working on the Zooming functionality in my own plugin.
Its still wonky, but im willing to share how the Zoom works so far.

ex:
hehe.. you're right. ;)
i just wanted to see if it can be done. I had it working in UDK. :)
I wanted to create a Color picker.. like this one:     Simple Pallet
Ohhh.. Look..



i know.. i used allot of sliders to guess the gradients, but i got it very close :D