Disk Jockey for macOS: Settings
Enable Sounds
Turns on and off the cute interface sounds.
Stringent Extensions
When enabled, Disk Jockey will insist on using the proper extensions for the disk images.
Enable R.O.N. Mode for Disk Sizes
As the warning says, this lets you create very large images. And, as the warning also says, if you enable this, you’re on your own.
Note that Disk Jockey will not create images larger than the maximum free space available on your local disk (because that would be horrifyingly bad).