Runes, Masteries, Afkers, Feeders, "elo boosters" etc - some ideas.
First off, runes - lets face it, they're stale. They're raw stats. We don't have a whole lot of utility type runes, there's many that people don't use. Crit has no defense, except goads of hp and high armor. Most people run snowball type runes. Flats, and counter it with flat seals. We also have no way to rid of old runes that are just filling space and low tier. How about...
On-hit effect runes, tenacity, crit defense, damage to towers, damage to minions or defense. How about some more % based runes? or maybe even a special rune slot for a single rune that offers one of those things? How about a rune that reflects % damage of either magic or physical to counter lifesteal or hardcore ap nukers? I bet it would be a nightmare to balance, but one needs more than just new champions to keep a game fresh.
Masteries, because "Meta" changed from people being so oddly positioned in past games to tank top, jg assassin, mage mid, marksman and sup bot yet we have only 3, many of the utility masteries are lackluster, the tank masteries are fine, the damage masteries are quite broke and vastly gold efficient stat wise total over the other 2 making most people go 21/9/0. A lot of mmorpgs have skill trees for specific characters that offer vast diversity so and or either completely revamp it so it caters to more lane positions, or such as "increase dot tic by 0.2 sec per point upto 3 points for a total of an extra second" I know people would love it for Liandry's mask, or malz's space aids, and at the very 21st point, it would offer a buff to one of the summoner spells specifically for that lane. Stronger smite, ignite that does something else or more, the ability to make cleanse work as an aoe if you're close enough. Teleport with a slight lesser cooldown time for top tanks.
Afkers, everyone rages. My proposition is SIMPLE- vote kick, and once they are kicked, people in que can join with a differed level of average between the whole team and a fixed amount of gold for the time that has passed. You can check a ticker box whether you'd like to be able to join those types of games. To prevent abuse, you can only do it when they're legitimately AFK IE leave buster flagged/red name. I'm sure some people will try to be clever and just dance or buy sunfire and afk in jungle or something of the likes or spam wards/randomly move around. My proposition is if they haven't engaged with the enemy or came near a team mate OUTSIDE of the base for at least 3 minutes they can be vote kicked. What about feeders and such? Unfortunately that I can't answer and the best thing is report in my opinion, although harsher penalty.
What about the whole "gang bang report him!" raging? What about people screaming in /all to report x person? Perhaps riot should take it into consideration and consider it a form of harassment when people threaten to report. If you're going to report, then do it. You don't need others bandwagoning because you're angry, and if it's justified I'm sure others will as well. Can't fix everything!
Elo boosters, now this is obnoxious. We've all came across sites while looking for guides and builds because coincidentally they list them as a means of drawing traffic. It's unfair for a diamond 1 or challenger to play someone from bronze 4 to gold 5. You may not realize it, but at some point if you've played ranked and got demolished HARD, it was probably a smurf or elo booster. Nothing wrong with someone making a new account and climbing the ladders, but paying to get up in ranks? Yeah, plenty wrong, and unfair. It not only ruins a lot of peoples day, it also gets unskilled people so high up the ladder they wreck several peoples games if they so decide to try to play in those brackets where skill levels far surpass their own. Mac Address, or perhaps IP? What about when someone gets a new computer, what about routers and dynamic isp numbers? I'm sure someone here has more knowledge regarding such and perhaps has a solution?
What about poro pets, and poro pet battles! Take a break from the actual game? A mini game of sorts, kind of like pokemon. I want a slave yordle! :) Mastering a champion beyond 5 should grant something reaaaaaaalllllllly neat. An aura, maybe a random pet pops up like a poro following you around. Your skills get shiner or glow more or maybe a visual upgrade in some way to your ult. Lux's beam could have glitter around the sides or something, cho's chomp could be bloody, you know to be true to "insta giblets", teemo's mushrooms would give off a spooky miasma cloud. But yeah, I mostly want the loss of LP fixed in ranked when people afk for whatever reason, more ult runes or perhaps a new rune slot. Things like that! What's your guys thoughts?