More information on tooltips would be cool
First off, scalings. No one likes math. And, not everyone can do a calculation super fast to find out how much damage their abilities will do with all the scalings they have. Instead of just saying Damage(+Scale of AP), the tooltip could say Damage(+Scale of AP) [Combined Damage] Also, having the scalings on the tooltips of the abilities would be super helpful as well. Like, just under all the text, it says This skill's damage is boosted by X% of your Ability Power. Some actually say the scalings, but it's mainly just for special scalings like on Rammus and Taric. Another thing, auto-attack modifiers. Having it say how long the effect lasts would be nice. Again, some already say this, but most don't. For example, instead of just saying "The next attack deals bonus damage", it can say, "The next attack within X seconds deals bonus damage."
E. at first you will need to learn what it does obviously, but after a game or two you know what it does and the tooltip could just be "base dmg=X bonus AP damage=X total damage=X damage per second=X mana refund=X". i dont need to have this text about it jumping to other targets etc.