gruntjs - yeoman / cssmin - Minimize, but don't concat CSS files -

I am working on a webapp (using the male webpage generator) and I have two SCS base files, my Standard (main SCSS) and my old-ie (main-old- ie.scss) - using this technique:

Is there a way to minimize files, but there is no contat on Build ?

and then you can pass this option when it is less than your processing Is less.