After digitizing my super8 movies I found out that the odd and even frames of the movie require different color, brightness and contrast corrections to optimize the movie.  All the odd frames need similar corrections and so do the even frames. That is why a feature allowing to apply video corrections selective to the odd or to the even frames of a scene would be a very interesting feature. If more users noted this artefact it  would be a commercial interesting feature and it could be added to the keyframing window as an extra option. Therefore my request to add this option.