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removing partition walls:

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In small remodel jobs on old buildings, what's the standard of practice for
restoring the shear capacity (if any) of minor partition walls that get
removed?

Very often these are lath and plaster walls on post and beam foundations, with
liittle or no shear capacity to begin with.

If one undertakes a rigorous analysis of the entire structure, the entire
structure is found to be inadequate.  When upgrading the entire structure is
not part of the owner's scope, installing one shear panel, with new grade
beam, hold-downs, etc. in the wall seems inappropriate.

If one attempts merely to restore the capacity that was removed, simply adding
plywood to the remaining portion usually satisfies this, in terms of
distributing shear to the floor diaphragm.  (assuming floor joists above the
wall are adequate for dragging shear into the remaining panel.)

Thanks,
Brian Veit, P.E.