Good morning.
SanchoMod has never had a cheat for unlocking the OEM gallery, it has it's own gallery that is already completely unlocked and does NOT unlock the scenes as you play them. This is done on purpose so you can still use the OEM gallery as "achievements", to unlock through normal playthrough. This has always been the case and done so by design. To open the "SanchoGallery" see below.
For "PeepingTom" what SanchoMod does is let you know when a particular Choice has one contained that you might not otherwise know about. Other PT's are in-game but don't require you to have made a certain choice for them to be seen.
SanchoMod has never published a mod with a specific "gallery unlock" button as it's my opinion that this is a disservice to the player since it takes away their "achievement" collection ability during normal playthroughs. This is why SanchoGallery is
independent of the VN's gallery. If I misunderstood what you're asking then please square me up.