I have a set of icons and they have their own associated classes. I would like to see this set of icons in the Icon window in Maestro (with their associated classes, not from font-awesome). How could I achieve this?
There's no way to do this currently. There is an outstanding feature request in JIRA for this (TPD-4765).
Depending on your circumstance, you could embed the icon ref in a rich text property, for example this works in a field label:
<i class="fa fa-pencil"> </i> Edit