i think it will be a good idea to have a restore button in the stamps library that copys all the names of the stampfiles into the definition file. i am suggesting this beacause i have over 666 stamp files (i am not joking) and it will take me ages to copy and paste them.
If you have Linux, you can run this in the stamps folder (If stamps.def already exists, it will fail silently): test ! -f stamps.def && find . -maxdepth 1 -name '*.stm' -printf %f | sed -r -e 's/([0-9a-z]{10})\.stm/\1/g' > stamps.def
I didn't see any Windows batch scripts to do this job.
IMO, stamp management is funky. I think enabled and disabled stamps should be kept in separate directories, and stamps.def should be generated automatically from existing stamp filenames if it doesn't exist.