Very, very good job.  Just a few minor questions/comments suggested below for your consideration:

FIRST ACTIOn ITEM (REMOVE "LIKELY"):

4.1 Success Criteria

1. (1) if "all of" accessibility prompting..?
   (2) definitions of accessibility prompting, checking, and repairing (if needed)?
   (3) ..not already active by default "at the same time,"?
   (4) "a mechanism for.." instead of "the mechanism for.."?

2. (1)"All configuration controls" instead of "The configuration controls"?
   (2) which are "these accessibility related functions"?  Reference?
   (2) Definition and testability (objectivity) of "full part of"?
   (3) Definition (perhaps example) of "general configuration area"?

3. (1) Definition (perhaps example) of "general configuration area"?
   (2) "All configuration controls" instead of "the configuration controls"?
   (3) which are "these accessibility related functions"?  Reference?
   (4) Testability and objectivity of "must be handled in the same manner"? How
       could this be measured?
   (5) "as any configuration controls for"?
   (6) For "all" other functions?  Other "similar" functions?

4. (1) which are "these accessibility related functions"?  Reference?
   (2) "must include all accessibility.." instead of "must include the accessibility.."?
   (3) Definition/example of "highest level" (closest to user?) and definition/example of "combined user interface"? 

SECOND ACTION ITEM (USABILITY OVER-RIDE):

4.1 (1) What is "them"?
    (2) "all typical authors"?  "Several typical authors"?
    (3) "must be able to" instead of "are able to"?
    (4) "all accessibility-related prompting functions, checking functions, repair functions,
        and documentation"?
    (5) definition/example of "several representative states"?

4.2 (1) "any authoring task" instead of "an authoring task"? 
    (2) "all typical authors"?  "Several typical authors"?
    (3) Testability and objectivity of "tend to locate"?  How would this be measured?  "Must tend to locate"?
    (4) "more" implies two choices; "most" implies three or more? 
    (5) definition, testability, objectivity, and measurement of "more accessible means"?

4.3 (1) Objectivity and testability of "to guess"?
    (2) definition of "third-party developer"?
    (3) "all typical authors"?  "Several typical authors"?
    (4) "must not tend to" in place of "do not tend to"?
    (5) testing and measurement of a negation "not tend to"? 
    (6) "any accessibility-related prompting functions, checking functions, repair functions,
        and documentation"
    (7) "more frequently" in place of "any more frequently"?
    (8) "any other features of the tool"?  Other similar features?  In all instances? 


PS - I apologize in advance if I've misread any of the material proposed.