I posted this originally post this as a response in Arcane Archer discussion, thought I'd post it here where its also relevant.

I discovered something that makes using Improved Precise Shot a bit more effective. It has been mentioned to always use tab key for target cycling to find farther mob and attack that one. Thus your arrows will hit all the mobs in between. The default function for the tab key is "select next combat target". Using this method can be a bit slow or burdensome, especially if your 20secs of many shot is counting down.

Instead I changed the tab keys function to "select PREVIOUS combat target" and have changed the "select nearest combat target" to my middle mouse button. Pressing "select nearest" then imediately pressing "select previous" will select the farthest mob. This takes the "work" out of selecting the farthest mob, enabling you to concentrate on killing and surviving.