This is feedback/redesign is coming from World of Warcraft.
First, Is to merge Skill Speed and Spell Speed into a new stat call Haste. This would reduce the amount of materias in the item data base, and 2nd would already serves its purpose for what it is doing right now reducing GCD Cast Time and Recast.
The second part of this, which would make this new Haste stat interesting to some jobs, is to make it effect Dots and Hots. This is idea is from WoW. This would make Haste reduce the damage intervals of the Hot or Dot effect, ei, if you have 10% haste it would make your DoT or HoT tick down to 2.7 instead of 3 seconds. This essentially increases its "stat weight" while making it interesting