Aperture 3 White Balance range

Question

I recently took a handful of photos under some garishly unbalanced street lights. I took a greycard shot and used custom white balance in my Canon camera, which caused the photos to come out surprisingly well but not perfect.
When I loaded the photos up in Aperture, I thought that two or three pictures could use some additional tweaking. By making any white balance adjustment at all in the application, it reset the white balance to 2000K -- which is actually above the temperature of the lights.
I can't seem to manually set the white balance to any lower value, and the only way I can get rid of a color cast is to disable any White Balance adjustment (thus using the setting from the RAW file).
Is there any way to extend the range of Aperture's white balance adjustments? Is this the sort of thing that ought to work its way into a feature request?
(Just for conversation's sake, the location in question was the Campbell Community Center's parking lot during a San Jose Bike Party. Anyone from the Aperture team is welcome to take some snapshots there if they doubt the necessity of a wider white balance range...)

Answer 1

Have you tried tweaking it with the curves adjustment? Sometimes you correct colour casts a bit more precisely with a simple "auto split" curves adjustment, or by tweaking the curves themselves manually.
Have a look in the manual starting at p536 and also check out p549 specifically.