ESB also has PGC_2 coming first, so

15 + 179656 + 15 = 179686 That's Encoded# reported by DGIndex on the VOBs directly

12 + 179656 + 12 using Forced Film on the VOBs
or
0 + 179656 + 12 using Forced Film on the M2V from PgcDemux.

Only in the third scenario, the cave scene begins at 92104 just like g-force's trim() command.

I do see your point about default filename. Using PGCDemux the default name might have been VideoFile.m2v & VideoFile.d2v
Nevertheless, the trim() command is the deciding factor IMO.

It isn't always necessary, but in these (rare?) cases where PGC_2 comes first I think I would recommend going the M2V route.