Will it start if the oil crancase is full? If it does would'nt a note to self be a better way. While a shut off valve is a good idea, I can see someone forgetting to turn it on and smoking the engine ...
I think I would make myself a note to not add any oil how long would it take to pump the sump dry?
Just a thought.
Hand brakes are forgotten on all the time etc etc. An oil shutoff would scare me.