Shifting UV mean you have to increase / decrease the u or v or both of them.
It should work with all version off 3DGS but wont work on blocks I guess, only on models and compiled wmb(is that what it's called, the pre-compiled map?, sorry I forgot LoL)

I'm not suggesting you to change the texture setting, if you do, and save, then reload, you will notice that it will affect all the texture of the same type in the level,err.. is it?

About the undetected passable block, ty to compile the map with "Create mesh" unchecked.