Your SCSS files still need to go through the appropriate precompiler before you get a working output for your static assets.
In a properly configured development environment, you should respect that the static output directory is not hosted / distributed with your application sources, and the resulting CSS files will not be removed from your sources somewhere in a way that is not version controlled.
EDIT:
That's right, so I missed the correct problem. The only solution is to disable the compressor in development, including clearing the MIME precompiler mappings and resorting to conditionally including client-side compilers in your main template.
This will allow you to refer to the original, unauthorized by LESS and CoffeeScript in development, but, unfortunately, I can not find the SASS compiler on the client side.
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