A rating for slower games?

I think there should be a separate rating for slow games, do you agree? The current Classical time control allows game time all the way down to about 9 minutes which I think is too quick. How about introducing a new slow rating for games at, say, 25 minutes or more?

I want to see the ability to change timecontrol even more. My favorite time control is 40/15min then G/15 with a 3 second delay starting from move 1. I want to see move timecontrol ability.