Yes, these instances are actually a bug. Very late in the development like with 3 hours left I realized that rolling in traversal scenes was a real drag, so I removed the option and just made it so they were "free" zones. This really helped, but for some reason you can still roll in some of them, so I need to put a lock icon and fix anyway players can roll in non decision scenes. Also if you go the chapel and the priest is not there, it will require a roll and its only a move scene, but its supposed to be a free scene. So yes you can in some way exploit the mechanic. But it doesn't gain you all that much unless you are going for the "letter" ending. Because once you pass the door guard, the end game chance structure is not gameable.