I had the exact same problem as you, I solved it by doing my own css aggregation in my theme so I didn't have to hack core. I've written up my solution here:
http://drupal.org/node/254780
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do CSS aggregation in the theme
I had the exact same problem as you, I solved it by doing my own css aggregation in my theme so I didn't have to hack core. I've written up my solution here:
http://drupal.org/node/254780