I have to agree with ase, more problems could come of this than benefits. I don't think it will cause many players to take more precautions with their safes than they do now, but I could forsee quite a bit of trouble if this information spreads. As for the safe shielding, that might work for some players, but my bank can hold 37 safes. For me to shield them all, I would need an additional 37 safes. That's roughly 170 plat, which would be unresonable to keep people's gold safe, when it should already be safe. In my opinion, the distance safes should work on the z-axis should be, at most, the same as the x and y-axes.
As far as other command items go, the only other one I think would be a cause for concern would be feedoors. I'll test it out tomorrow to see how they work.