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 no “normie” but Linux is so damned ass backwards my brain just can’t cope, some of the times I was unsure if I was asking the OS to change directory or summon Moloch to bring a thousand years of darkness to the world.