To be honest, I usually hate on Button Combos. But if they are ALL 4-button combos designed specifically around NOT throwing off the game’s balance, and allowing you to perform actions much quicker for an edge then yes. But only applied where it makes sense.
Anyway, to make this work Melee would need to be much weaker in Halo 4 than it is in Halo 3 or Reach. Meaning it must be a 3-melee kill, not 2.
Following the Default Reach control scheme:
B, B/X, X/B/RT/LT - The ability to Melee then Shoot, Reload, Throw a grenade, or Melee again quickly. (Must at the same time melee attack impacts)
X, B/X, B/RT/LT - The ability to Reload then Shoot, Melee, or throw a grenade quickly. (Must time at the same time clip hits the gun)
LT, B/X, X/B/RT/LT - The ability to throw a grenade, then Shoot, Melee, Reload or throw another grenade quickly. (Must time at the same time Grenade releases from the hand)
There should be NO Button combos to increase the fire rate of your weapons, as there is no realistic way to do so, in all these cases, it is simply slight of hand, the ability to have your Spartan move faster than normal, but as weapons such as the BR are on a set fire rate, this fire rate should keep.
Also, Close Quarters Power Weapons should be powerful enough that using them at close quarters will beat B/X combos. But depending on the combo itself. The Shotgun, Sword, and Hammer, for instance, would beat the hell out of B/X/RT (2 hit kill). But Automatics had a disadvantage against it. Automatics, however, beat B/X/X/B/X/X/B (3 hit kill Melee combo).
As well, these combos won’t feel like “rapid-fire” attacks like they were in Halo 2. There will be a timing and flow to them, you can’t just press RB, wait for the gun to hit, then spam B/X-B. After Pressing B, then X(When mentioned above), you must again wait for your weapon to reset (it won’t show a melee, just a more “snap to” default stance, that is much faster than default, THEN press the action you wish to perform.
It should be approximately 3/4 the speed of a regular Melee attack.
The way this should appear in animation isn’t “flailing Melees in the air” either. Upon hitting the “B/X” it should simply look like your weapon is resetting to it’s default position faster.