1. It doesn't work very well for the warlock attached to you with Dark Intent. Your uptime on the debuff will drop some while the shadowfiend is out (once every 90 seconds or so). If you are the highest eligible DPS in the raid by a large factor, then this won't really matter much, because the amount of dps you can contrinbute doing this far outweights the loss to the warlock (~1000 dps, minus ~200). However if it comes down to a choice between you and, say, a boomkin or a fire mage who is doing equivalent DPS to you, it becomes more of a gray area. You will want to talk this out with the warlock in your raid before you start changing your rotation significantly.