I suspect that, from PG's perspective, this is a bad idea.
It would lead to ever increasing user expectations taking up more resources and leading to potential bad feelings.
Hmmm. I feel the lack of acknowledgement leads to bad feelings.
PG already go further than most companies in soliciting and acting on user input
Perhaps this is true if you are comparing them to large corporations but I work with several small companies that are much more responsive. And this tends to foster a stronger community! You even get a group of power users like Pipeline who help move the product forward and educate other users.
So +1 to OP even though I doubt it will happen (they haven't acknowledged this thread about more acknowledgement!)