Almost as useful as the night elf wisp racial. Almost.
"nitro boosts provide no DPS gain" what? For melee, they can be incredibly useful for quickly streaking back into melee range. Take bladelord ta'yak for example. Can shoot straight through his little frogger wind maze. Nitro boosts+stampeding roar (in that order) = insane speed boost.The question is, "How is this ability balanced with other professions?" The simple fact of the matter is that no other profession has anything comparable. Therefore, using it or not should be a flip of the coin - realistically, if it ever has the ability to save your life it is overpowered (as it could be used only in those situations - failure would provide no loss, success would provide a gain). If it ever provides a DPS gain, it has to be balanced with an equal chance of a DPS loss - this can be accomplished by stressing healer mana, by providing a risk of death, or perhaps a loss of movement speed.
Awful idea. You can be healed through the damage the DoT puts on you. (and some classes can remove it/avoid its application) But in your scenario, use nitro boosts and then have the boss drop a OKO voidzone on you? GG.Perhaps a 50% chance of success, where failure results in an undispellable root (or moving at 1/x speed, where x is whatever speed you move at with success)?
That would just make them pointless. But hey, we know how fun the gnomish gravity well is, right?Having them removed from raid instances, or combat altogether (really, raid instances in combat, but one of the other two options would provide for easier implementation), is really the best option for solving balance concerns.