A button that would turn DOpus in Queue Mode.
For any button/hotkey pressed in the mode a list of pending operations would be displayed allowing user to put the action associated with the button/hotkey in queue witch chosen pending operation.
This would allow for operations like these described in the post:
If it happened for every button, I think it would be intolerable. That would mean you couldn't do things like switch between Details and Thumbnails mode, or use Select All, or click a folder on the Favorites Bar to go to it, without it either prompting you about queuing the command or delaying the command until all previous operations (including long file copies) completed.
I think it would be a lot more complex than that if it was going to work well.
Select ALL in queue is desirable.
Queue Mode as main program mode could be inconvenient.
Beside
there could be "Run now".