I struggled with how to implement this. Initially I thought just having a single compression parameter would be best. It would have 3 possible values: True - compress with default 'x' compression, False - no compression, 'yui' - compress with YUI compressor. But then I thought that might be a little confusing so I decided to go with the second parameter.
Add option to specify compression type.
Sorry for my late reply. Thanks for this!