Maybe I'm overthinking this, but short of a shutoff valve indoors, what other security measures should I take into account if I was to have a gas pipe leadoff on the exterior of my home ?

After Sandy, I plan to have natural gas as a fuel source for the generator.
My neighbor has this for this grill already.

I'm the latter and the thought of a *gas source* accessible is quite a thing.
On the exterior, I am thiking a short stub with a ball valved (keyed/hole for padlock type) and then the quick disconnect right off that fitting.

Any other safety precautions on the whole gasoline - exterior to be keen on