A helpful feature would be the ability to select all pieces in a certain material. If this function were to be implemented, the easiest way to go about it would be to activate the material selection tool and select any piece, which in turn selects all pieces with the matching color as the piece. This would be especially useful for changing colors en masse that are few and far between that a simple use of "B" couldn't handle efficiently.

I hope my suggestion is considered. Thank you (: