Suggestion for Dark Harvest/Katarina Gameplay

Okay. So, I'm a Katarina main. And I absolutely LOVE the champion and recently I was getting a little bored of the Electrocute meta. So I decided to try something else. However, currently there is one, viable path to take on her - Electrocute with whatever secondary and tertiary runes that you want(Maybe Predator if you're feeling a bit spicy). But that's about it. That's the entire selection you have to choose from if you want to be useful. Hail of Blades isn't viable on her for obvious reasons, but what about Dark Harvest? Since it only works with auto attacks, you can't use it on Katarina unless you forfeit a TON of DPS to auto attack in a teamfight. With Predator, the bonus damage works on all of your abilities, and you also get movespeed.

What Riot should do is change Dark Harvest to work with all of your abilities. Keep it at the single-use per stack type that it's at now, but make it so it works on abilities and auto attacks instead of just auto attacks. I think this could fix a lot of problems that it seems to have right now, while also providing extra choice for your playstyle. It would probably have to be nerfed a bit (or maybe nerf Katarina if it happens) so it's not insanely overpowered, but you're barely going to be achieving 150 stacks by the end of the game, so it shouldn't be doing too much damage. If you have any other ideas for this, feel free to share.

Just a thought.