WYSIWYG For Maintenance Fields

I was wondering if there is anyway to get the WYSIWYG editor to appear on the Maintenance page field. This is where you type the message that you want to appear when the site is in maintenance mode.

I can't seem to find a way to apply it to the field as it isn't a plain text or anything and yet you can type HTML tags into this. There must be other fields within configuration that would be useful to have this as well?

Thanks