More Training Modes (CS Training/Skillshot Training)
I definitely wouldn't mind more training modes so I can try to perform better.
CS Training: One of which would be a CS Training where the game will immediately put us in a game we choose what champion we want to play, lower the attack damage of the champion to a number like 50 or 60, and then practice training on creeps versus a bot in Howling Abyss. The mode can have a goal marker for how much you need per 3-5 minutes, and a gold estimator between you and the bot to show how much accurate csing makes a difference in the game. Also it may be cool to try to implement an indicator above a minion on when to actually last hit. Also there should be the option of doing it against a bot, a player, or by yourself. Sometimes doing it with harassment can help.
Skillshot Training: Another specialized training mode can be skillshot training. This can be in Howling Abyss. The idea of this mode is for it to be 1 player versus bots. Hordes of random champion bots will come along with a minion wave. They don't do damage to you, but all they do is push the minion wave and attack towers. (granted they don't have a lot of damage). At the beginning they are pretty noobish, but as time progresses the hordes get more adept and can dodge skillshots more frequently. The idea is that the champion you play has super-decreased cooldowns, like in URF, and the bots can only take damage with skillshots (Bots also have super decreased health). The idea is that the player needs to fend off the hordes of bots using just skillshots, and nothing else, while also pushing the minion wave and getting to the nexus. While the bots still have super decreased HP, they start to use their skills on you, after you get to their nexus turret. I think this would be a really fun training mode, to get players acclimated to the use of skillshots whether they use smartcast or not (I personally don't).