Yeah it is actually pretty amazing how good performance dayz gets on the deck, even on deathmatch servers with 25+ players in a small area it runs great.
The gunplay is superb especially with some of the more common weapon mods.
Not sure why arma 3 runs so much worse in comparison, the difference is massive.
Just install blender from the discover app on the steam desktop, add it to steam as a non-steam game and you can launch it as you would any other game.
As for controls I prefer joysticks + gyro, but that is just me.