Nikko, I must have misunderstood (or misread) your situtation. I used to have a boss who would make us install double pole circuit breakers whenever we used multiwire branch circuits. Me and another guy used to argue about it with him until one day we just gave up trying to convince him that it didn't need to be done. He told us both that it was his liability insurance and not ours. Now I work for a guy who prefers that I do not use 3-wire branch circuits even though in the end it'll save a few bucks and perhaps 'that' money could be going into my pockets!
