This plugin is simple and genius! Forget about that cluttered and fairly useless space to the right of the admin menu--this makes it something productive. When installed, one has a set of default icons installed for them. Delete or move about as you see fit. Then, copy and paste any admin page URL from any functionality that exists in your sidebar menu and stick them into Notepad for convenience (when doing multiple shortcuts). Open the button editor, create new entries, select appropriate buttons, and paste the short URL.
Voila! Go straight to any submenu GUI page for any app--without having to find the main item and then clicking, then searching down the options. Click, and you are there with your most frequently needed admin screens. Works well with v4.8.2