Compass creating multiple sprite files for different coloured themes under the same icon name
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I'm looking to do the following and I just can't seem to work out how without a fair amount of fiddling.

I want to have two icon sets for my theme. One black. One white. My theme has two different colour schemes you can pick from. Grey and blue. On the grey theme, I want black icons, on the blue theme I want white.

I have created my original black icon set fine and have included them in a folder `icon/*.png`

Now what I'd like to use is the Nested Folder setup where my icons are in the following folders `icon/black/*.png` and `icon/white/*.png`

The problem with this is my icons will be named like so `black-add` and `white-add` where what I really want is `icon-add` so that I don't have to change my themes `@import icon-sprite(add)` lines and I just include the correct `sprites/_black` or `sprites/_white` in the top level theme sass file.

Is there some configuration I'm missing that allows me to do this? or am I going about this in the wrong way? 

I've worked around the issue by creating a generic icon/*.png folder with all the icons, then copying the generated _icon.sass file and editing it for the black and white icons. then includeing 'sprites/black' in my grey theme and 'sprites/white' in my blue one. This works, but it's a bit of a PITA when you want to add new icons.

Any help here would be greatly appreciated!