gistfile1.txt

NEW

``disambiguate-add-year-suffix`` [Step (4)]
    If set to "true" ("false" is the default), an alphabetic year-suffix is
    added to ambiguous cites (e.g. "Doe 2007, Doe 2007" becomes "Doe 2007a, Doe
    2007b") and to their corresponding bibliographic entries. The assignment of
    the year-suffixes follows the order of the bibliographies entries, and
    additional letters are used once "z" is reached ("z", "aa", "ab", ..., "az",
    "ba", etc.). By default the year-suffix is appended to the cite, and to the
    first year rendered through ``cs:date`` in the bibliographic entry, but its
    location can be controlled by explicitly rendering the "year-suffix" variable
    using ``cs:text``. If "year-suffix" is rendered through ``cs:text`` in the
    scope of ``cs:citation``, it is suppressed for ``cs:bibliography``, unless
    it is also rendered through ``cs:text`` in the scope of ``cs:bibliography``,
    and vice versa.

OLD

``disambiguate-add-year-suffix`` [Step (4)]
    If set to "true" ("false" is the default), a year-suffix is added to
    ambiguous cites (e.g. "Doe 2007, Doe 2007" becomes "Doe 2007a, Doe 2007b").
    The placement of the year-suffix, by default appended to each cite, can be
    controlled by explictly rendering the "year-suffix" variable using
    ``cs:text``.

Yes. In those four cases, adding initials or full given names is more aggressive than strictly necessary for resolving cite/bib ambiguities. If one were to be picky, it would be a little more accurate to say "disambiguation is performed only when needed to create an unambiguous link between the cite and the target bibliographic entry".

+1 Picky is good in specification work.