What about a shortcut to switch between apps running without selecting it with the finger, cycle-like as ALT + TAB on desktops. Press the shortcut n times to go through all apps running without taking the hands off the keyboard.

Also, a shortcut to end current task, without the need of unmaximize it (on microb, for example) and pressing X close.

I love to use only the keyboard when it possible and faster/easier.