Added:
A new field to let you add Class for each button
A new field to let you add ID for each button
What is the usage?
Sometimes you need to do something in your site, when a specific element with a specific class or id is clicked (for example, in my Tours and Hints add-on, the tour and the hint will start as soon as you click on an element with the class of xftours and xfhints). Now you can add those buttons in the floating menu and give them the appropriate class and/or id.