It would be a good thing to be able to run multiple gscan2pdfs without incident. In particular, one might want to scan one book, and begin running the very slow** post-processing steps* of rotate, crop, unpaper, & OCR, and while one waits on the first gscan2pdf, run a second one.
Currently, one *may*, with a patch*** be able to 1) export the scans in the first gscan2pdf, 2) close it, 3) start up a second one & start scanning, 4) start a third gscan2pdf and import #1, 5) begin postprocessing #4. But this is quite a dance to do.
* I've found one can, overall, scan much faster by disabling these steps during the scan
** Very slow due to lack of parallelism; see https://sourceforge.net/tracker/index.php?func=detail&aid=2965498&group_id=174140&atid=868101
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