Since we are talking about champion nerfs and buffs: There are several champions which I play that make me think, "Boy, if this guys had an AD or an AP ratio on this x skill, it would be great".
A historical example would be Twitch. I believe he was one of the older champions, and some people complained about his Ability power ratio on his E Expunge. (Why have an AP ratio if he scales better with AD) And of course, Riot heard us and eventually gave us an AD ratio on his E. Thank you for that.
Champions I would consider adding a ratio include:
Mordekaiser: an AD ratio on his E Syphon of Destruction. I like to play AD Mordekaiser, even though it's considered troll build. If he had even a super low ratio it would make it possible. I know his kit is geared towards AP, and this might affect his gameplay massively. Please consider.
Gangplank: an AD ratio on his Ultimate. Gangplank deals pitiful damage with his Ultimate, and on top of that its unreliable (random on purpose). Essentially its a giant slow. An AD ratio would give him a little more bite.
Leona: AD ratio on her Q or W. it would make her more viable in another role besides bot support. She is pigeon-holed into that role, as much as I love it.
Rammus: Move the damage portion from Q to his E. Rammus has a lot of utility, but damage isn't part of it outside of his ultimate. Since no one builds AP Rammus, building Ability Power or Magic Penetration is generally considered useless. Since everyone maxes his E first, would Riot consider giving it some damage?
Fizz: AD ratio on his Q, not necessary, but would be nice since a number of people do play him that way.
Any of my suggested changes may or may not change gameplay on the above champions, but I would like to hear your thoughts.