I was just looking at the live demo for PunBB 1.3 and when I edit a post, leaving Silent edit on, it does not display the "Last edited by.." line, and when I edit the post again, now unchecking Silent edit, it displays "Last edited by..". Everything ok for now But when I edit this post again, and I leave Silent edit on, it stills shows (the previous) "Last edited by..". I'm not sure whether this is really a bad thing, but when I read the description next to it ("don't display "Last edited by ?" in topic view"), it's not really what is does It does not display the last edit. Maybe it's better to remove it too, but that's for you folks to decide, just thought mentioning it.
Anyhow, looking forward using the new PunBB, great job!