RGBAW Fixtures

All,
Will be using Pixel mad to control some Martin Stage Bar 54's on an upcoming tour. Need to know if any support for RGBAW fixture has been added or if I should use the stage bars in "3 channel per pixel mode" and let the fixture determine how much Amber and White to add in.
Anyone done this? Does it look cool?
Cheers!
Robb

Just a warning, when the fixture adds in Amber and White, it might have a bit of a delay compared to realtime control from PixelMAD. The best way to do this is to create multiple fixtures in PixelMAD. One RGB one A and one W. Then map them over one another as different mixes with the same layers.