ventluc,
We don't have an option to automatically show it horizontally. The main reason is that each template is restricted in very unique ways for horizontal views, whereas for vertical, the default layout generally just works.
If you want to modify our login module's looks though, we use quite a few CSS styles on each of our buttons and links, have parameters to hide/show most features, and you can also modify the main HTML template file at /modules/mod_sclogin/tmpl/login.php. We recommend, if you're going to edit that file, to copy it to /templates/<YOUR_TEMPLATE>/html/mod_sclogin/login.php and edit it there though. That will prevent your changes from being overwritten as you upgrade JFBConnect.
Hope that helps, but if you need more assistance, we'll do what we can.
Thanks,
Alex