Riot: Solution to "I want to try 'X' build out" - Training Dummies

So I really wish there was a way to track your different damages/heals to enemy/ally players, and I thought to myself, hey, what if League had training dummies? Would it be possible to have a mode where you go in and there are training dummies with a chart that breaks down your different damaging/healing abilities and displays it to you? It would be really neat to have a way to break down different combos and show where your damage is coming from. It would also help with trying out different masteries/rune combinations to determine which works best for you. You could have different set up for the dummies as well for like aoe/line targeting and what not. It would also be possible to give the dummies armor/mr stats to show how much damage you will have reduced on super tanky targets. I think this would be an excellent addition to League and would provide players a great opportunity to test out different builds and combos that they come up with. If this could get some Riot feedback that would be awesome :)

The shop would be free and you could buy/sell experience from it to set your lvl to whatever you prefer. The settings for the dummies could be in there as well, and you could "purchase" their stats.