One thing I've considered for a possible change to MCH since 4.0 is adding back in Lead Shot with changes:

Lead Shot
Potency: 50 *Small buff from 3.x
DoT Potency: 35 *Nerf from 3.x
DoT Duration: 30 Seconds *No change
Additional Effect: Open Wound (-5% Piercing Resistance on affected target.) *NEW

It is a straight DPS gain for MCH (~12%) on the magnitude needed to put us above BRD and adds a bit more dimension (snapshotting LS into personal + raid buffs) for the class after neutering the heat dynamic in 4.05. Also adds small utility bonus for cases of when a DRG and/or BRD is present.

Second change I would love to see is in Dismantle. Either reduce the cooldown to 60 seconds or increase the duration to 10 seconds. The 5 second duration is too clunky at present, especially when the recast is 90 seconds. Just give it the Disable treatment. If 60 seconds is too short for SE, then increase the duration to 10 seconds. Makes it less hectic to use.