There's no administrative way that I'm aware of... like anything with Magento though, if you need to custom edit the frontend output you can do so with either an xml update or phtml edits...
I'm sure there's both an xml and phtml hook for the short description... just google around... you can also always enable 'template path hints' from the advanced config and then you'll know what phtml files are controlling various areas of your category page
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