Output URL generated by wp_list_categories as querystring?

Greetings all, this is related to a post I just made, but is a separate issue – is it possible to have the URL’s generated by wp_list_categories formatted as a querystring instead of a permalink? So, instead of:

<li><a href="www.site.com/location/houston">Houston</a></li>
<li><a href="www.site.com/location/dallas">Dallas</a></li>
<li><a href="www.site.com/location/austin">Austin</a></li>

…have it output:

<li><a href="www.site.com/?location=houston">Houston</a></li>
<li><a href="www.site.com/?location=dallas">Dallas</a></li>
<li><a href="www.site.com/?location=austin">Austin</a></li>

I know this isn’t optimal, but I need the functionality temporarily.

Thanks!