Please enable navigation via arrow keys inside Library and Browser.
Library has a limited keyboard navigation support, as long as it's within a tool category. For example, you can navigate inside English tools, but can't go to Greek Tools using the keyboard.
Browser has no keyboard navigation support at all, so I need to use the trackpad/mouse to select the next item in the list. This gets tiring.
I think being able to navigate the browser with up / down arrow keys, and where appropriate right and left keys to open and close the triangle disclosure handles will be great.