I'd forgotten to point out that the mode toggle for the eraser tool showed up in SVN, along with the main eraser mode that it enables:
When that mode is enabled (which should be the default) the eraser tool acts more like a vector eraser than a raster eraser:
As you can see, it allows someone to zig-zag around and delete objects very selectively. The functional details need to be tuned up a bit, as it doesn't behave well with clicks as opposed to drags. However, it should be enough to see what the feel is and how it's different from the other mode.
Now all I have to do is get my tablet happy with Hardy and I can get those details like width, etc., nailed down.