Train at different types of positions

Hello, it would be really cool, that to train to win this or that position, we can put any type of positions on a baker (party editor) and then we propose a challenge, in casual on exactly, this position, and that when someone accepts thecasual challenge, we can play the position we want :)
For example to train on the finals, the pawn structures ...
Are you for or against ?

Sorry for my english, I m french!

I think it would be pretty cool (although there's quite a rating differential between you and me)