I'm not sure if this has been suggested/requested before, did a quick google search and couldn't find a mention.
I think that it would make the forums much more usable if clicking a thread name took you to the first unread post rather than to the OP. Surely this is the desired destination in nearly every forum topic click and would make navigating the forums on a mobile device much much better.
May probably cut down on unnecessary page requests as well.
EDIT: I know about the little button that does this but it is nigh on impossible to touch on my iphone without zooming in lots. We get the thread -> latest post behaviour if selecting a title from the 'Last Post' section on the right hand side of the forums at the higher level.