This option is available for batch queues only. If this is set the batch queue is automatically saved each time an item is added or removed. This helps if the auto remove option is selected and the software crashes or the PC fails for whatever reason. In this case the batch queue will still contain the correct entries required to re-start from the point of failure.
This option can be used conjunction with the ability to automatically load and run a batch queue using the command line option to Test Script Runner GUI:-
AUTORUN=<Batch Queue File Name>