I'm pretty sure it alreacy has it, check the settings. (Just checked it's in Settings->[Username] Settings->Show Read Posts)
Mark read on scroll though is the setting I'm waiting for but will probably have to wait for Boost that will no doubt have all those kind of more advanced settings like it did for reddit.
I'm new to this PT game, just installed Jellyfin then started digging into the arr-verse and installed Jackett and Sonarr to populate Jellyfin with all the old shows that aren't shown anymore, found SG-1 and The Lost Room without too much trouble but Sonarr is having problems with Warehouse 13 at the moment.
So with r/opensignups gone, what's another way to know when PT's are offering sign ups?