1 I expetc mouse wheel can be used to browse each folder tab, that is, place your mouse over an activated tab, rolling your mouse wheel up will made it jump to previous tab, and rolling your mouse wheel down will made it jump to next tab. More effective when browsing tabs with a mouse.
2 As you know, "Next" and "Previous" button will appear on the right side of the tabs bar when tabs are too many to show in the bar (the setting: "Tabs on mutiple lines" unchecked), and single clicks do the task of browsing tabs tab by tab.
Now I expect right click on the buttons make the tabs bar browsed "bar by by bar", much faster than the way tab by tab (maybe this operation can be called tabs PageUp/PageDown
).