• Keys in the cascade renamed to Cascade Keybindings (Controls -> Mouse &
  keyboard)
• Any modifier combination can be bound. The five lists used to take a bare
  key or Shift plus a key; Ctrl, Alt and Win now count for as much, alone or
  in any combination, so Ctrl+W can close the window under the pointer and
  Alt+Q can cancel the cascade
• Mouse buttons are bindable too: left, right, middle and the two side
  buttons, on their own or under modifiers. The pointer's own bindings
  (pick / close / drag) are consulted first, so a button already set to one
  of those keeps doing exactly that
• Escape and Enter can be rebound. The picker used to hold both back because
  they were how the dialog itself was cancelled and accepted, which left the
  cascade's two most obvious keys as the only ones nobody could move. The
  Cancel button is the way out now, so every key is recordable
• A modifier on its own (Ctrl, Win) is the one thing that cannot be an
  entry: the cascade answers modifier keys before it consults any binding,
  so such an entry could only ever look bound
• The Search warning now concerns only bindings with no modifier. Anything
  held with a key is a combination reached for deliberately, not a character
  that could go missing from a query
• Each list holds five keys rather than seven. The whole list reaches the
  core as one indivisible value so a keystroke can never meet it
  half-updated, and full modifier masks cost room inside it. Lists ship with
  three; a configuration carrying six or seven keeps them on the page, but
  only the first five act
• Commit is Confirm throughout the interface: the card, the dialog that
  records the key, and Confirm gesture on the Touchpad page. Nothing changes
  in config.json