[Edit: just occurred to me that until you have /pet hold this would be a totally useless spell, whoops]
Here is my probably way overpowered idea that likely can't even be done because of coding:
Replace the "useless Pet Hastes" with a one shot buff that procs mez, each new spell increasing the duration.
Blam- SK Pets now have a use (one shot mez machine), but because of long recast (on the existing haste spells- maybe make it even longer) and the fact pets will probably be killed every time it wouldn't be to overpowering (maybe).
It would also give SKs an answer to AoE aggro (well, very limited anyhow- oh crap 5 mobs, I'll stop ONE!!) without stepping on Paladin toes of ACTUAL AoE aggro.
"Shadowknights derive their powers from Marlow, whose strength lies in manipulation, trickery and careful progress (so they manipulate aggro, fear, mez and tank better) ."