Basically, do it like XenForo does. I figure this shouldn't be all that difficult of a mod, but...
Pretty much, instead of having to click the little tiny arrow icon next to a thread to start reading at your first unread post in a thread, make the title of the thread do this.
Make the little arrow then go to the first post in a thread.
I think people by far want to start at the first unread post much more than the first post of a thread, so why make it small and difficult to click?
As you know, I no longer run vB, but as a user of vB (on your site and some others), this is something that I've learned to hate having to deal with, now that I see how well it works out on my XenForo site. So... it'd just make things better all around, and even if you don't make it a mod/template edit or whatever... do it here on your site, please?