Firstly, I really like your plugin!
while trying to create mt PHP code in the plugin I found out that I can only put code in the CSS/SCRIPT/PHP sections. can you please add a note that on advanced usage the "ShortCode Template" section has no effect (unless I misunderstand...)
and another thing, to use the custom attributes in the PHP you need to use the $ sign. this took me 2 hours to find out...
It's not a complaint, but if you can add some documentation for future users that would be great!
Thanks again Ohad!