When you state this....
I have yet to find a way to have task updates be automatically approved by
someone other than the person who created the task.
.... this is not possible. Only the status manager can approve the update
(automatically or not).
In the previous post, when I said all his updates, I meant all the updates
that are awaiting to be approved by him, rather than his tasks, which I
assume is what you read... So, a PM can automatically accept all the updates
that have come to him (as he is the status manager) from the resources that
have updated the tasks in the my tasks page of PWA. This automatic
acceptance is done via the rules as I have described. It works happily for
me on several customer sites, and I would not envisage it working any other
way. I do not have to get PMs to run the rule as you describe.