Gold Advantage
I was just looking at my match history after my first ranked game of the season, and I saw the gold advantage section. I was thinking, that it would be a great in game statistic to have. I don't know how you would incorporate it into the game, but It would be great if both teams could see their gold advantage during the game.
Whether it be, if you don't have the lead it shows a -X amount of gold or it says blue team ahead by X amount of gold, I just thought that this would be a great game mechanic. I think that it would really help people keep things realistic. I have been in a lot of games where people think we are losing just cause we lost 1 team fight, but if Riot incorporated this, it would show that would be false, and keep people thinking realistically.
Please Riot, I think this would really improve the gaming experience for league. :D