The 'On Cancel' option is just a backup in case you accidently click the 'Stop' button by mistake while ripping. It will also ask if you want to delete the incomplete files.
If you enable this option - you will in such a case see this window:
Both of these settings are personal but default works fine for most.
The default setting is 'enabled'.
Delete Incomplete Files:
Ask
Yes
No
On Error
Flash Taskbar Button
The default setting is 'disabled'.
On Exit
Clear Recent Files List
The default setting is 'disabled'.
Save the Queue
Here you have the option to let the program automatically saving the queue when you close the program.
The default setting is 'disabled'.
Overwrite Existing
The default setting is 'enabled'.
Save the Log
Here you have the option to let the program automatically saving the file log when you close the program.
The default setting is 'disabled'.
Append Existing
If enabled the program will add the latest log to the existing log.
The default setting is 'enabled'.
Overwrite Existing
If you select this - the old logfile will be overwritten. If you disable it the logifle will be saved as ImgBurn(1).log where the number will be replaced with a higher number next time you save a log file.