Riot help me practice

Many people play custom games for fun (when they have 6 people or they want to 1 v 1), and mamy play them to practice dodging/landing skill shots and kiting and attack moving...etc

I think it would be more fun for when people play against each other, and more helpful in practicing if there was an urf mode for custom games

How many people have went into a custom to practice skill shots and just had to stand there for 8 seconds between each hit and the other? It barely helps your reflixes and having spears thrown at you every second would probably be more helpful

Im not just suggesting to have an option to change the cooldowns/mana but any othet options like going back to full health without recalling, making jg monsters spawn faster or any other options that would help people who try to learn in customs