Crowd Control shortens the cooldown before Focus is ready again. It is a Tier 2 Ranged skill that matters most in Horde fights, where you want slow motion as often as possible.
Yes, if you use Focus a lot. Hordes are much easier when Focus comes back quickly.
Focused Shot, Under Pressure and Hyperfocus.
Use Focus in short bursts for headshots, then let it recharge while you reposition.