Hi Juk, even though you probably don't have much time to do anything with fphg right now, I figured since fphg already distinguishes observed hand histories from hero played hands, this might not be too enormous of a task to request.
How about adding an extra configuration parameter, "OBSERVED_OUTPUT_PATH" or similar, in addition to "OUTPUT_PATH", which would cause observed hand histories to be stored in separate folder? Background for this request is that as you probably know, fphg sometimes writes malformed hand histories, and if they are hero hands, they are imported into tracker databases and messing up session tracking, reports, etc. Having different folders for observed hands would allow trackers to import only observed hands (where random errors don't matter as much), and bet pot scripts etc read from hero hands folder.