Sorry - what I meant was the C3 Image Editor texture having to be greater than the spritesheet size. Many times, I load the texture that was embedded in GLB into the image editor, and this becomes an issue since the texture tends to be lower res (pixel art etc.).
I usually pad or combine textures, but it would help if I didn't have to. Not a deal breaker in any way - just curious if this is a limitation you're planning to remove.