As i told, the sony keyset tv works with ps3/4 via bravia sync.

Honestly don't know if ps4 have infrared (guess not), so maybe the only way is that.

And maybe is the best way, i mean, hardly someone will use it as "replacement" to game, most will use it for media remote for watching movies.

This is a big maybe, but don't know if could be implemented, the touch panel of the dualshock 4, in some way the N900 works like it.

Is a crazy idea that honestly speaking, most probably won't work.

Anyway, my intention wasn't that you put again the missing buttons, just want to inform that you can use Pierogi to control the ps4.

Greetings.