Rich Text Editor v4: Add Custom Fonts and Option for Default Font

In the latest versions of the Rich Text Editor v4 there is an incredibly limited selection of fonts available. 

I would like the option to add custom fonts to the widget and also choose one the fonts to be the default selection for each use of the widget. At the moment the default is Helvetica.

Now when you use the Rich Text Editor and the font is different from what you are using in the rest of the application it is extremely noticable and distracting for users.

The option to add custom fonts would really keep the look and feel of an application consistent. Having custom fonts would add real business value.