Track unread posts in database instead of cookies

As we know, PunBB marks unread posts using cookies. And it was maybe fine... in 2005. Today this makes few disadvantages. The main reason - posts aren't marked properly while using various devices, like PCs, smarphones, tablets, etc.
Example: I check forums on my PC and read all unread messages, next I go to job and while traveling I use smarphone to continue reading - and posts that I read before on my other device are still marked as unread.
PunBB 1.4.3 to be more modern introduced even a responsive design. I think this proposed feature is a MUST HAVE.
If you don't know what I am writing about, check this extension: http://punbb.informer.com/forums/topic/ … abase-102/