Second the need for a "Top" button, and a "Latest" button for when you have read partway through a long thread and just want to get to the end now.

I also second the request for a more obvious way to get back to the list of topics (and when the list of topics has become huge, back to the same position in the list where I was). This is desktop. I clicked the Sqwok logo upper left and it seemed to do it but it was a blind guess.