Quote:Improved Slam probably works like the Flash Heal cast time reduction of the prophecy set. The bonus reduces Flash Heal's cast time to 1.4 seconds, AND reduces the global cooldown Flash Heal causes to 1.4 seconds. Improved Slam may reduce the global cooldown Slam causes in such a way that you can still spam Slam.
Sadly, from testing, it only reduces the casting time of Slam, but the Global Cooldown is still there. Compare the Improved Flash Heal effects to Improved Slam. The second effect is what supposedly modifies the global cooldown.
Thus, the biggest limiter to Endless Rage becomes global cooldown rathen than anything else. You can get off about 6 instant abilities in that time, so anything like "Mortal Strike, Whirlwind, Slam, Slam, Slam, Mortal Strike, Slam, Slam" is impossible.
Consider also the fact that Endless Rage costs a significant chunk of rage in the first place, which is counterintuitive to its alleged purpose, and you get a talent that has good intentions (I like the idea itself of this talent), but suffers from poor implementation.
Edit: links didn't show up properly =(