A must-have !
However, I have a suggestion : can you add a "multiple selection" by SHIFT+Clicking on items, so we can activate severals of them in the same tab ? Also, please remove the click on the background that makes a deselection of the items, it's very disturbing (I like to click on backgrounds to "neutralize" my mouse selection, but here, it unselect items ; we could just rely on the "pause" button to unselect items).