Let's see... this is gonna be a little all over the place.
You can only use Binding Shot if you do not use Silencing Shot - depends a little on group comp
Scatter Shot - 30s CD - can be used for interrupt on most mobs
Silencing Shot - 20s CD - Interrupt and 3s no spellcasting
Narrow Escape - webbing mobs on each Disengage.. situational use, you will probably want to spec into CTHC though
Glaive Toss - 15s CD - 30% snare for 3s
Ice Trap - 30s CD - AOE ground slow and 4s move prevention (for SV)
Snake Trap - 30s CD - 4s move prevention (SV only)
several pets have different single-target interrupts, disarms, roots, webs, stuns on relatively short CDs
Intimidation - 3s pet stun
Deterrence - varying CD depending on talents - I list this here, because you can use the hunter to taunt a mob (boss?) - to have him hit on the hunter for a few seconds while in deterrence so the tank gets a short break (glyph Deterrence)
If you glyph Mirroring Blades, you got yourself a spell reflect (could be useful combined with the hunter taunt right before a cast)... I doubt that it really will be good/useful though.
Bloodlust - if there is no other class to bring it
Battle res - if there is no other class to do it as well
So it seems like the only thing you can use hunters for are:
A) insane AOE damage (as SV)
A1) a lot of burst damage (more or less every minute - and a lot every 5 minutes when Readiness is up) AND sustained damage
interrupts of casters
C) last defense with Ice Trap/Snake Trap to stun (I think its more of a root actually) all targets for a few seconds while tank gets out to get healed up
D) lots of utility (Pack for running for example), being able to kite the hard hitting mobs while others die etc etc
E) tons of single target control
I am probably forgetting a few right now, but it is a start