Navigation in Task View

When a task is opened for viewing, there could be buttons in the task pop up to allow quickly navigating to the next task in the same list or the next one, instead of having to close down the current task and then opening the next one. There could also be hotkeys to allow this, e.g., Ctrl+Up to move to the task above in the same list, Ctrl+Down to move to next task in the list, Ctrl+Left for moving to a task in the list on the left, Ctrl+ Right to move to the list on the right.