Need a way to cancel an operation

If you've got hundreds of clips in your Queue panel, operations can become extremely sluggish - that needs to be fixed. But if you accidentally pick the wrong setting to apply, the app can beachball for many, many minutes with no way of cancelling the operation . Then you have to wait for as long again to undo the same operation. We need a simple Comman-. or Esc cancel option to be able to stop such time-suck behaviour.