Paz,
Glad it was just the render key. It is a good feature and one we quickly realized was required when we added tags to the component and couldn't add them to forum posts (or other areas) without them being rendered right way. Now we can add {JFBCLike} wherever we want. The main point though was to prevent user's from doing something silly on your site, though there's not too much 'bad' that could be done with a tag, it's just not best to give users that power
For the Comment Counts, that's a language string. You can edit it in the /languages/en_GB/en_GB.com_jfbconnect.ini file or use the Language Manager override system of Joomla. The string you're looking for is:
COM_JFBCONNECT_COMMENTS_COUNT="Number of Comments: %s"
Just change that to "%s" and it should do what you're looking for.
Hope that helps!
Alex