Bashiok replied to a question about this thread today:
The tick rate of channeled skills is currently scaled by your weapon speed. This has the side effect of making the resource cost go up, which we’re okay with. It’s consistent with the philosophy that faster speed weapons consume more resource but may do more damage. Channeled skills might still be better with slower weapons though because on a channeled skill, you have as much mobility as you want, so the “mobility” and “overkill” advantages of faster weapons are eroded with channeled abilities, so all you’re left with is increased mana cost for increased damage.
We've been thinking of changing the tooltips and going with “ continuously does X% weapon damage”. The reservations we currently have are:
* Even though we say continuously, there’s a pulse rate under the hood, so do players want to know this pulse rate?
* If we did show a pulse rate, we’re adding more complexity to an already complicated tooltip.
However, the benefit of being able to directly compare 135% weapon damage on Disintegrate to X% weapon damage on another skill is super high, so we love that.
Stepping back and going big picture, we’re currently working on greatly simplifying tooltips. It’s too early to give details at this point, but our general feeling is that we provide way too much information in the skill tooltips in general.