If I understand you correctly, you're asking how film shooters who scan get metadata into the scanned files--the sort of stuff that, if shot digitally, would have been captured by the camera in the EXIF?
Sadly, I do it all by hand. I use Expression Media custom fields for things like film type, EI, developer type and time, etc. I also record the usual stuff like city, state, photographer contact info, just like I would for digital-source images.