major4579 - try using existing or custom keyboard shortcuts - Clear marked books is Ctrl+Shift+M. And View Manager sets up a 'blank' keyboard shortcut for each View you define, which you can customise.
And/or use the book list context menu (use Shift+F10 if you don't have a menu key), move up and down with ↑ ↓ and traverse flyouts with → ←. I put frequently used Tools at either end of the list.
I don't have any icon tool bars. Just a one item menu bar - Preferences, but only because its mandatory to have Preferences somewhere.

so, why not put it here ==>>
BR