It's not clear what you're asking here. The buffer is only for the last 90 minutes. If you're paused for more than 90 minutes you only get the last 90 minutes. Pause doesn't automatically turn itself off after 90 minutes either.
Just because you're not worried about burn in doesn't mean others aren't.
I expected it to come out of pause after 90 minutes (didn't Tivo do this after its 30 minute buffer timed out?). Not saying this is a Tivo or should act like a Tivo, but that was my reference from years ago...
An option to enable disable screen saver would be nice. I am not worried about burn-in, so I would turn it off as it annoys the heck out of me. For those concerned about burn-in they could leave it enabled. Default of enabled is fine, just let me disable it.