How to center the mashup to client's location?

I’m trying to enable the center_client_location option for the PGM mashup and so far I’m failing to find any relevant info. How can I do that via the shortcode? Or by tweaking the plugin code?

Btw, do you have a list with all shortcodes and attributes available?

Thanks in advance!

PS: Forgot to mention that I changed the default value to true. However, the “google.loader.ClientLocation” varailable is still NULL.

http://wordpress.org/extend/plugins/pronamic-google-maps/