I just submitted a new asset to the Unity Asset Store. It’s called Back Button, and allows you to do more with your mouse, like, for instance, use it’s back button!
That is, in fact, something that Unity does not support in the editor, probably because it’s multi-platform, and so I had to jump through a few hoops to catch the events manually (through a native DLL of course).
Of course, it does more than just catch mouse events. Back Button is also a clever Favorite system! You can Favorite anything you want, even project settings, which is more than you can with the default favorite system.