for example if i use Abomination, i must want to use Dread Shade on it, but it is usually casted to another target, although when i cast Dread Shade ,i have moved the mouse on the Abomination and it is heighlighted.
Yes this has been a complaint for a while now, not just with Dread Shade but with other skills that you have to target a certain minion (or a companion if in party). Not sure what the devs have planned for it but I know they are aware of the issue.