Screen tearing is when your game FPS is different to your screen FPS. Frame Generation in the game disables the ability to tweak VSync so the FPS is now down to your settings and PC config.
Additional vehicles. I really want a better version of the Merrimac. The one allowed seems limited and less appealing than the usual enclosed version. Should also be allowed to paint with Twintone.
Ricochet is only good out of combat and in stealth. Only good against NPCs stood still. Requires too much effort for moving targets. Has very limited uses otherwise.