How to Calc Ordinary Hazard Residential Areas?

When performing hydraulic calcs for NFPA 13 residential occupancies, what is the best approach to address small Ordinary Hazard rooms, such as janitor's closets or laundry rooms located on an otherwise-residential floor?

Room design is not always an option due to the prerequisites listed in NFPA 13, but area/density seems excessive when the calculation method given for residential occupancies is the 4 most demanding adjacent heads.

A 1,500 square foot area seems to go well beyond this approach, defeating the purpose of the residential design method. Other than room design, is there a justifiable code basis for calculating only the heads in the most demanding ordinary hazard room on such a floor?

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