I've done a commute like that. The speed limit on my road is 55mph. There is a decent shoulder, and the new road has a bike lane. The old one didn't, and I ended up taking possession of the lane on my bicycle and letting cars pass when that was useful.
Though I agree a 4 mile commute is totally bicycle friendly. My commute during school was 4.5 miles to school, 6 miles to my hubby's office to meet him for lunch, and 2.5 miles back home. I was in good shape doing that.
If you do end up using the Ninjette, I'd get a bicycle cable lock, run it through your jacket sleeve and the chin-bar of your helmet, and lock it to the frame of the bike. More secure than the normal helmet-loop.
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