I have a tendency to use font-awesome icons to show the user the state they will toggle too when they click on the button. This means i utilize ng-class to set which of the FA-**** classes it needs, but I still would like to have the ability to do this in the default icon component in Bootstrap Studio. All you would need to do is have a Icon Option that sets it to Font-Awesome Blank Icon.
Also what is your plans on supporting Font Awesome 5 Free/Pro versions?
By the way: First ever Bootstrap UI builder that I’ve managed to find a place for in my work flow, great job. Hope to see lots more updates.