would it be nice when a player could decide to place a piece of the color of the opponent as well ?

both players are still their initial colors .. but they can play a piece in the other color in their turn.

so for example i am white .. and at my first real move (after the 4 pieces in the center are placed) i move with a black piece turning one of my own (white) pieces to black ... then its blacks turn .. and he (of course) moves with black as well .. to turn my last white piece around to black ... making the while board black ... and black would have won

of course this would be bad of me .. so i wont be playing with my opponents piece at the first real move ... but further in the game it might create some interesting situations ?