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> My weak opinion is that a new parameter is a new API item, not just a change in behaviour, so should probably have "versionadded". 
This was my reasoning as well. 
Also, when I noticed so many instances of ``.. versionchanged`` that all say "Added the *x* parameter" (or whatever), it strikes me that these are a *large class of changes*, which all have some kind of addition in common. If you think about it, deprecations and removals are also changes, but they are a large-enough class of changes to merit a distinct markup directive. 
So, just as this is true for "deprecated" or "deprecated-removed", I believe it is just as true for "added". Once all additions, deprecations, and removals have been marked up as such, I think find that there’s still PLENTY of annotations that remain under ``.. versionchanged``. 
Put another way: 
Since these are all different types of changes, it is most useful to the reader if the most specific *type* of change is reflected in the markup.