Sam is correct about cels not being “Cinemascope”. Most original cels did not cover the entire animation frame, but only the characters themselves. I’m not sure about Warners, but Disney did some experimentation with CScope back in the 50’s. Both “Lady and the Tramp” and “Sleeping Beauty” were originally filmed that way. They also did a few shorts around 1954-55, among which was the Donald Duck short “Grand Canyonscope.” However, beacuse not all theaters were equipped with CScope projectors back then, the films had to be shot twice; once for CScope and again for standard projection ratios. For the most part, the only things that had to change were the backgrounds, as the animation cels themsleves could simply be maneuvered closer together.For a major feature like “Sleeping Beauty” it was worth the cost, but for a smaller one reel short, it was a major nuisance and was probably a contributing reason why Disney closed down the shorts program at the end of 1956.
As far as Disney is concerned, none of the Cinemascoped shorts have ever been released on video, or shown on TV as far as I know, although the features have shown up on video.