[development] where to put settings for a proxy script?

Hi list, For the mapping kit module, I am using a proxy script to fetch external map layers into the openlayers client. Some settings for this proxy script are now inside the script file itself, e.g. which target hosts to allow, or which types of content of responses to accept. What would be the preferable place for these settings? For performance reasons, the proxy doesn't bootstrap a minimal Drupal, so the settings will not be configurable through the admin pages. I liked the suggestion at http://drupal.org/node/685732#comment-2517110 to put the settings in the default settings file. Is this more often done for settings that are 'static'? Regards, John