Is there any option to enable a common error sound that is played if something unexpected was happen and the user attention is needed (e.g. file replace, copy failed, etc.).
That is very nice if DOpus is in the background and is busy with some long-term operations but the user does not see the dialogs.
You can use the Play command to add your own sound to the end of functions if you want. I.e. edit whichever command you use to copy files (the toolbar button, or drag & drop, or the paste command) and add a command that plays the sound file of your choice following the Copy command.
We'll add it to the list but I can't say when/if it will be implemented, whereas this is a solution you could implement yourself, right now, if it's important to you.
I doubt you use all that many ways of copying files that it would take more than a couple of minutes.