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IBC Fire Walls and Seismic Code

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Under the IBC, the area separation walls from the UBC are gone, and the corresponding wall is a Fire Wall.
The primary difference is the ability of one side of the structure to collapse, without taking down the wall.  The commentary clearly shows the diaphragm sheathing as discontinuous at the Fire Wall in Type V construction.
Question, how does this square with the seismic code provisions where all parts of the structure are to be interconnected, or a separation joint is to be provided?  Are we now supposed to provide 4 to 8 inch seismic joints at all area separation walls, essentially breaking the building into multiple buildings? 
Under the UBC Area Separation Walls it was permissible to have the sheathing extend through at the floor diaphragms, and the only problem was maintaining the rating through the assembly.
What are other people doing about this condition?