Hi, thanks for your post.
I will look into having a more generic way to set the default icon in the next few days.
At the time I couldn't find an easy way to select from all the icons so I settled for a dropdown with a few items, as leaving a textfield felt bad as one would have to know the internal name in order to set the value. But your post shows it wasn't such a great idea either.
I'll see if there is a better way to select the icon from the settings, if not, worst case scenario I'll add an "other..." option to the dropdown and a text field, this should accomodate cases such as yours.