Boostah is just a simple base calculation... You need to put 1 point in next talents: Improve Steady Shot, Termination, Resistance is futile or 2nd point in Rapid Killing, to reach 20 points and go forward on mm spec. Now it's your choise and is just about how you'll go for leveling: I know some hunters who go start with aimed shot, so 2 points in RK. In my opinion is better to go with 1 point in Rapid Killing, 0 points Careful Aim and 3 points Improve Steady Shot, special for mobs level 82+, when will not be 2-3 shot / kill.

Well, having played in the beta myself I can tell ya that with the exception of a few special quest 'bosses' there really wasn't much of a difference between the mobs in Mont Hyjal/Vasjh'ir and those in Twilight Highlands when it came to how quickly they died, or the number of shots I needed to kill them.

I did realize that you need to put a point somewhere to get to a lower tier (that is, after all how the talent trees work) but the second point in RK just seems like a real waste to me. I'm personally opting for the resistance is futile point to get that occasional free Kill Command, I was just curious as to Frostheim's reasoning behind the 2 RK points.