Currently is not possible to convert Querystrings to flat keyword. The ajax requests are send via the pair name value.
As I see you use php and maybe Apache. With Apache you can use mod_rewrite to do that in .htaccess file.
Another possible solution is to use global $.ajaxSetup and beforeSend callback. In this callback you can grab the url and convert it to flat keywords. For more details see jQuery documentation
Regards
Tony
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