Best solution is to use a somewhat standard format in that the topic links to the first unread post. Pretty sure most of the scripts perform the same, not requiring you to click on a little round circle to read the newest post.
XenForo - click on topic takes you to first unread post
Burning Board - click on topic takes you to the first unread post
myBB - click on the topic takes you to the first unread post
Seeing a trend here yet? IPS is apparently the only one that the users have to learn a whole new process for. Really helps towards that user friendliness, requiring them to learn a whole new process JUST to use your site compared to other (possibly competitor) sites that they use. Guess which they will tend to keep going back to? Odds are it's not going to be the strange duck that requires them to have to relearn/think about what is "normal" for them on other sites.
And to top it off, clicking on that little round button is not "easy" on mobile when compared to clicking on that nice long topic text.