Allow to change the icon on the toggle button element

[jrdemontfort]

For the Toggle element, the icon is fixed as a plus sign, please can you allow us to use our own icons (from whatever icon sets are available e.g. Font awesome etc) Please also allow us to animate / transform that icon on click (as happens presently with the plus sign)

This could be used on any custom design where the toggle element has a different icon than the plus sign or just a different kind of plus sign that fits the site design more effectively.

[jamescrabb]

Simple change that you would of thought to be included as standard.

I believe you can change it using CSS but it should be in the GUI

[dcolumbus]

Why hasn't this simple request been done yet? Seems so weird to not allow the customization of the icon within the UI.