I've been copying old haloscan comments that would not import into WP. I change the timestamp in each one and delete the URL for the commenter because most of the links are no longer valid.
In the Comment Edit UI, "tab across" to the next field does not work like it should. Because I have carpal tunnel, I use the mouse as little as possible and use the tab key to jump from field to field. Changing the timestamp has been a headache because each time I hit the tab key I end up in the Name field at the top of the screen. Especially frustrating on the laptop without a mouse.
The whole Comment Edit UI needs to have the tab order reworked.