Allow users to post locations / add markers in frontend, without login in

Hi! First of all, thanks to the developers for this awesome plugin, I’ve started recently to have a look at it and I’m very impressed about the easy of use and multiple possibilities. I’ve been searching and reading on the net about this topic but haven’t found anything clear for the moment, is there a way to allow non-registered users to add markers to a map? A way to show in frontend a form that implements GeoMashup location editing and where the public user can publish a geolocated post (adding a marker to the map) without having to log in the WP Admin?
Any help or directions, much appreciated.
Thank you!

http://wordpress.org/extend/plugins/geo-mashup/