Training option idea

I suck at . I have no idea how people beat me with him... I don't understand how to make him work. I want to get better at Darius.
I have decided that one skill I lack with Darius is hitting that "sweet spot" on his Q to do maximum damage. I would like the ability to be able to toggle a skill's hit pattern to be ON as an overlay during a Bot or Custom match. Darius's Q is autocast, so unless I mouse over the skill I can not see the pattern.

Trial and error has failed me to this point.