I have a related question.
Say you have your scope connected to a 30VDC power rail with a coax or X1 probe, and you accidentally hit the 50 ohm impedance button. Now you have 0.6A (0.6A=30/50) going into the scope, and the scope is dissipating 18W (18W=30*30/50). I think this would damage the scope. Am i right, or am I missing something? It bothers me a lot that you could blow up your scope by accidentally pushing a single button.