Custom Game Options?

I think it would be cool if there were some extra custom game options for those who want to practice certain things or just mess around when they just feel like relaxing in a custom game.

Examples:

Cooldown Reduction. 10%, 20%, 30%, or even 80%.(Wink Wink) Would also apply to summoner spells.

Maybe someone wants to practice flashing over walls, getting used to skillshot ranges, or whatever else.

Attack Speed. From 0.01 to 2.50. Manually set by player.

Practicing last hitting? Maybe kiting with certain attack speed? This option would be nice as well.

Runes. Being able to choose from EVERY. SINGLE. RUNE. Even if you don't have them.

Ever had that time when you wanna try out a custom rune page, but you don't have the runes you want, and you really don't want to grind out over 10,000 IP just to make 1 rune page? Yeah. Being able to choose from every rune in the game would be nice in custom games, so you can see what it will be like when you DO finally get the rune. Kind of works like a rune tester.

Masteries. Being able to have all the mastery points, or even maybe just having infinite mastery points. Heh.

Could be directed towards new players. New players are limited by levels and have to level up before they can spend their point on say, 1.25 attack speed. Great. Having all mastery points could help new players test mastery points and their usages, like the rune tester. Or, you could just have infinite mastery points and be flowing with tiny bonuses throughout the entire game.

These options may have to be tweaked a little, (or a lot) but I think these extra options could make custom games great for League of Legends players. Rito plz.