u don't
This gives me the feeling you haven't played a mage, considering they have a personal aspect of the fox with 3 charges and 20 second CD (yes ice floes, and yes they can hearth/mount/anything on the move with it as well now). Comparing MM hunter to frost mage, they are shooting out procs on gcd 70% of the time now with ice floes for any inbetween casts when MM only have a 2 second window after atleast staying still for 3 seconds. Besides that, personally I feel that MM doesn't feel smooth without focusing shot. <80% hp, a non crit AS/Chimera means most of your focus is gone. Focusing lines up well with sniper training and restoring the big chunks of lost focus.
Currently I'm MM, 636 with 8 pris sockets and BM OS.. Mid changing to BM main spec though, our raid comp has 3 MM hunters and 2 resto shammies and an enhance shammt. Not only will we need solid burst AoE but none of our mail users roll multi and 5/6 roll crit in their BiS gear. Atleast this was I can /roll my BiS gear without competition. Also considering the raid mechanics in highmaul a hunter that can constantly move and dps to soak/burst/aoe/etc is a plus.
In the end if you aren't hardcore play what you like the most