I certainly wouldn't change directions if the hall way was connected to another area. Such as a living room or dinning room. I have laid parallel with the joists in my own home because it looks better than running across the joists. Engineered truss type 2' OC with 3/4 T&G plywood no problems after 3yrs.
Let me add this to your concern what if it's an "L" shaped hall way will you run both parts of the hall way the length ways or all the same direction. Because of the small area of the hall there is less chance of movement and appearance or flow is more important so if coming of another area i would maintain the flow be it across the joist or parallel as I would maintain continuity in an "L" shaped hall.
Last edited by Zero Punch; 05-30-2006 at 07:07 PM.