This plugin adds the ability to geo-locate topics in bbPress and to search topics by location from a new search widget.
How can I customize the templates ?
Plugin templates are loaded with the function bbptl_locate_template(). That function first checks if a template exists in your themes then load the default templates of the plugin. So, if you want to have the plugin using your custom templates, just create a directory "bbpress-topic-location" under your current theme direction, copy the files from the bbpress-topic-location/theme in it, and edit those files. Please be careful and don't remove hooks because this could break the plugin.
How can I use functionnalities this plugin have elsewhere on my website ?
See functions listed in the file bbptl-template-tags.php