Suggestion for turn based games

Hey everybody, I was thinking about a new feature for the turn based games.
You can already play lots of starting positions, but wouldn't it be cool to be able to set up your own positions as starting positions?

This way you can re-play some cool positions you reached with your opponents. I have already been in the situation that me or my opponent said "if I made that move on the x-th turn, the game might have turned", so this might be interesting?

Tell me what you think!

Kind regards. 

Like this:

Starting Positions 

:) 

I knew those starting positions... that's not what I mean.

I mean the possibility to set up your own position.. so you can replay endgame and middlegame positions