Practice Mode on League?

So i'm positive this has been brought before in the past probably, but I honestly think this suggestion should be thought through.

Wouldn't it be a good idea to have a Practice Mode in League? Similar to Co-Op, but it gives you control over the game for practice purposes and such, including: the team you face (OR can enter 1v1 with bot), starting level, what lanes are actually being used/have minions dispersed, free item usage or ability to make it run like normal game in terms of currency, etc.

Lets say I wanted to play and I wanted to get better at using her against certain champions and other things such as testing out certain builds. With a practice mode I could easily do this freely and build a better strategy on how to handle the champ without having to worry about getting to a full build or playing properly in a stressed Normal game.

Now I do understand the experience that comes from just going ahead and testing things out in Normal games or Co-Op with bots, but this would be a more hands on approach in terms of testing things out on champions, especially if you were trying to practice going against a specific champion and full build.

I think it'd be a great idea to initiate and i'm actually a little surprised it hasn't been done. The Co-Op is great for beginners, but I think even seasoned players could benefit from this Practice Mode and how it can be set up for fine tuning training for a champ or team. And hek, you can even have your ranked team with you in Practice Mode, and train them going against specific team set ups as practice as well.

Thoughts?