Trello has some great shortcut key functionality where if you hover your mouse over a given task, and press a single letter keyboard key, it will perform an action on that task.
For instance:
  • Pressing "c" archives that task
  • Pressing "d" opens up the due date picker of the task
  • Pressing "t" will edit the title of the task
I would love the above shortcuts available on hover in addition to a shortcut that let me "close" a card.