I'm a lazyperson and focus macros are great for Vigilance and Focus Magic and other such abilies. Well i found a 2 click macro that works for the party and if extended probably the raid as well. Although i wouldn't use it for things such as Power Infusion or other cooldowns because even when you right click or middle click it casts the spell before applying the focus.

/focus [button:2,@party1]
/focus [button:3,@party2]
/focus [modifier:alt,@party3]
/focus [modifier:shift,@party4]
/cast [@focus] Focus Magic