Have you ever wanted to allow your site users to add content to your site without giving them full access to all of the posts? Well now you can with HTM Custom Areas for wordpress. This plugin allows the administrator to select which user types can create custom area posts, the administrator can then use the shortcode icon on the editor to insert the custom post content inside of their own posts. To add this to a sidebar the administrator can create a text widget and place the shortcode inside of this.

Add a button to the TinyMCE editor toolbar to make it easy for users to add footnotes with the proper syntax for the Simple Footnotes plugin.