To be honest, I have never tried to mount an Image and then use the CD Copy option on the Mounted Image file. It was never meant to work that way.
Before our software does any kind of copy operation, it needs to know what speeds the source drive can sustain. In most cases, we have this contained in our CDROM.CFG file contained in the Nero folder.
But you are using our Nero ImageDrive to mount an Image, and our Nero software see's it as a Recorder even though it's really your Hard Drive. It's unable to use locate the Max Read speeds or Audio Extraction capabilities of the Image drive.
Why don't you just unmount the Image file, and then use the option to Burn Image To Disc. This way you will not have the problem with it doing a simulation first.