Implement a practice mode
A significant portion of the League population wants to practice last-hitting through a custom game. However, it's so tedious to exit every game at the 5, 10, or 20 minute mark just to restart from the beginning. It'd be quite a gift if Riot could implement a practice mode so we can save time resetting each game.
Additionally, if Riot does go along with this plan, I'd also like to see a practice mode for Junglers to Smite objectives. Unlike laners, who can always practice last-hitting, Junglers do not have that luxury by themselves. We must either practice in a PvP match or get a bunch of friends to help with Smiting.
So the way the practice mode for last-hitting would go like this. At Champ Select, you select your Lane, your opponent, and your champion along with any Runes, Masteries, and Summoner Spells. You spawn in fountain so you can get your usual items, and you are locked to your lane, meaning there's a barrier preventing you from going to other lanes. Once minions spawn, you can practice last-hitting. At some point, if you choose to, you can reset the match with a button, with a hotkey, by recalling, or by going through the menu. This restarts the match to the beginning.
For the Jungler's version, the player selectsr the team compositions. Once the game starts, the player selects one of two modes and the location. The player can have Stealing mode, where he/she tries to steal Baron or Dragon from the enemy team or Securing mode where the player's team is attacking Baron or Dragon and must hit Smite. After the objective dies, the player selects the mode and location again.
This might be complicated, programming-wise, but this would be a great addition to the game.