Hi, thanks for posting!
You can control the build configuration used by NCrunch by adjusting the project-level NCrunch configuration option, 'Use build configuration'.
NCrunch will normally use the default build configuration specified in the .proj file if you don't supply one, so normally this will just be DEBUG. Note that you can set this configuration option while using multiple selection in the configuration dialog, so it's possible to set the option for all of your projects at once instead of one at a time.
Cheers,
REmco