Modifier Keys To Open
Could you make Ctrl + Click on a button open the target object in a tab but replace the currently focused tab. This is useful if you have the layout you like, you just want to swap out one book for another one in that same spot.
Could you make middle mouse button open the object in new tab always please.
For example, middle mouse button press on a book in my favorites would open it in a new tab.
Or any button on the toolbar. Links, basically anything. Or maybe Ctrl + MM for links in text, to keep the free scroll available.
What would be really nice is anything opened with the MM button would stack the tab against the currently selected tab group, instead of it crossing over to the other group, or filling up the empty space. I would use an auto-fill space always. Not having to re-enlarge my windows when I close something. Maybe Ctrl + click would be to open new tab in empty space. MM button open new tab in group.