Aperture 3 update. Why is there still no eraser for the retouch tool?

Question

Perhaps I'm missing something, but: Why is there still no eraser for the retouch tool?
I realize you can delete retouch strokes, but they are in linear order so you often have to delete useful ones to go far enough back to get the one that you've decided no longer works.
I would rather have the ability to erase strokes back to the original image, much like the way the History Brush works in Photoshop, and indeed the eraser tool works in many other Aperture bricks.
Example, I retouch an eye, and then move on to retouch an ear.  Then I decide I don't like the eye brush strokes.  In order to remove one stroke on the eye retouch, I have to delete all the successful brush strokes I've made to the ear (i.e. those that came after the stroke I wish to remove from the eye).  This is needlessly complicated and inefficient.
Many of other bricks in Aperture have an eraser tool to selectively remove brushstrokes.  Why not the retouch tool?
Also, many other bricks in Aperture allow for stacking or layering bricks of the same adjustment with different brush choices.  Why not the retouch tool?
Am I missing something?

Answer 1

We are just users here.  Feature Enhancement requests need to be made via Apple's official approved channel.  You can get there from within Aperture by clicking "Aperture➞Provide Aperture Feedback".
Retouching (and cloning) involves not just applying a transformation to the selected pixels, but basing that transformation on _other, non-contiguous_ pixels sampled from the image.  This leads me to think that there may be intractable technical problems setting up the kind of workflow you propose.