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This is an old topic, but still seems to come up a lot in the searches. For the sake of the poor souls that may still be looking for an answer, here's a way to change the file size.
When saving the script you will get a prompt for "Additional command line parameters for imaging tool:". By default, you should see this switch: /max:2GB.
Modify the size to meet your needs. Deleting the switch completely will remove the size limit and images will be saved as a single file.