Ideas to make the game more balanced/ efficient

Hello, my name is Diego. I have a couple of ideas that I came up with through my gameplay experience up to level 18 on this account. Please, feel free to respond about what you think about these ideas. (FYI: They are very raw)

league of legends limit to 4 abilities

abilties like masteries or abiltiies have coabilities: choose patch as u go coould choose damage or cdr or tenacity for each skill i.e. two mouses

each takedown gives piece of turret damage (top laners) or it will give daamge 1 min after takedown (more hp, more turret damage)

Flash 2: longer distance flash, next flash shorter distance, etc..

I will explain each idea soon in a reply thread.