We use barcodes as separator sheets (plus some inconsequential value). I have Quick Fields looking for this in the First Page Identification step. 

There are also a couple more barcodes that could be applied based on the type of document (confidential, restricted, etc). This secondary barcode would always be in the same spot and there would not be two secondary barcodes, because that's just silly. 

Under the Page Processing step, I am looking for this secondary barcode (if it exists), then I have a couple Conditional processes to see what secondary barcode was applied. If we have a winner, I'm setting an aptly named token (confidential and restricted, respectively) to true. 

This QF session passes these processed documents off to a fancy Workflow for additional magic, whereas the tokens act as parameters.

I'm confused about the page range section of the Assign token step. Does the Page Range apply to all pages of a separated document or the entire batch? If they are just referring to the pages in a split document, does it really matter if I select a certain page (like page 1) for the token vs all pages? And if the Page Range is referring to the entire batch, then, darn.