Middle click a listed tab to close that tab

I would love if middle-clicking on a link in Tabs Outliner closed the tab, instead of opening a copy of it. Middle click normally closes a tab when you are using the normal interface, and I think this is a natural extension to the Outliner.

I find the trash button cumbersome because it is small, only appears when a link is hovered over, and doesn't appear correctly when you click it once (you have to move the mouse at least 1 pixel for it to re-appear for the tab that moved under the mouse).

In the same vein, shift+middle-click would make a very good shortcut for the green X, to save a tab.