Rage Pool system

[Samintosh]

I was talking to my DM yesterday about finding something for my barbarian because I wanted something different than "I enter rage. I smash people."

Something came to my mind and I have figured that monks have the Ki points to spend during the day and during the fight to be more flexible.
Could a barbarian have something similar? Of course only when raging, and because the rage have a limited round per day the Rage Pool do not scale on a modifier but it have just a cap. Until you are in rage you can use it.

I was thinking to:
If you hit you gain 1 point
if enemys hit you you gain 1 point
if you critical hit you gain 2 point
to a maximum of 10 Rage points.

The use of the Rage Pools are similar to the monk's Ki pool:
1pt - Make one additional attack at his highest attack bonus
1pt - take a +x to attack roll for 1 round
2pt - take +x to DR
10pt - if your next blow hit, it's a critical (still, you need to confirm)
etc.

do you have any ideas/adjustment?

[Cyrad]

Having it work off of getting hit is an antipattern. Characters want to build armor and not get hit. But you get rewarded for getting hit. So building armor actually reduces your point generation.

The options strike me as powerful to put ontop of the already powerful rage ability. They also don't really add any flexibility, which was the point of implementing this system in the first place. It also doesn't make much sense to me to have the capacity so high. I'd make the capacity lower since this is (in game design terms) a dynamic engine.

[VM mercenario]

This is a horrible idea.
First, the barbarian is already one of the best classes at dealing damage, he doesn't need any of this in any way.
Second you compare it to the monk, but the monk doesn't gain points except for a couple of archetypes, and even then it's not as easy as hitting an enemy.
Third, gaining a point everytime you hit someone and everytime they hit is just awfull from a game design stance. There is no balance possible.
Fourth, this in no way affects your proposed problem of "I enter rage. I smash people." It only makes it "I enter rage. I smash people. Harder."
Fifth the barbarian already has a serviceable pool of points in the rage rounds, no need to tack another one on top. Just create or improve some rage powers so you can spend a rage round and have a bonus out of combat. Like: "Raging Climber: Spend a rage round and gain a climb speed of 30ft for one minute." "Raging Swimmer: Spend a rage round and gain a swim speed of 30ft for one minute." Do the same with scent, darkvision and other utility abilities. Done, easy.