Making topics unread again!

[Archie bean]

I sometimes check Col on different devices, computer, phone iPad etc but if I switch quickly the recently unread topics don't all come up and I have to click on show all unread topics. Trouble is, on the iPad I keep accidentally hitting mark all topics as read! The two buttons are right next to each other and my fingers arent accurate enough! Is there a way of making them unread again?