When doing a "Change signature" refactoring to remove a parameter that is no longer necessary, it'd be nice if Resharper could also remove the associated XDoc entry in the declaring method. Similarly, it'd be nice (though not as important) if, when adding a new parameter, if an empty XDoc entry was inserted in the proper location, and if moving parameters around, the order of the XDoc entries was updated as well (though that's not strictly required, it's "nice" from a human-readable point of view).