Either the skis aren't moving, or I'm... (a classic folk saying).
Logically, what's the purpose of all these restrictions? Probably to prevent people from accessing certain areas before it's time...
When going to the treasure room on a small map, I don't think about the security of the treasure room, but about what treasures will be inside. So, no matter how you get there, the security of the treasure room is in no way comparable to the security of the treasures themselves...