I have a level 20 ranger
I also have a level 12/8 ranger/monk (i know it isn't exactly the most optimal build)
A nice capstone for a pure build ranger would be to bypass the current double shot penalty.
Right now it doesn't make sense to have a pure ranger if your goal is to be the highest most effective ranged DPS. The L6 monk splash allows you to bypass the double-shot penalty by activating 10Kstars in between to maintain your ranged DPS. If you are just a ranger, you work to get a 20-25% doubleshot that never goes off becasue it is suppressed by using your many shot. So finding a way to bypass that makes rangers better without requiring a monk nerf.
By the way: my monkchers's first life: warforged barbarian... so there.