Image data -> the width and height: are these handy as default width/height for the sprite data (where w and h are ratios)? The width/height perhaps optional; if left out then their values defaults to the widht/height of the image file.
Could be handy to have it somewhere, to use it to position the sprite correctly. And you're given the option to overwrite the width/height at this level.
Just a suggestion! I'm fine with the best solution, advice and your experience :-)
@abel: scaleX and scaleY: could suggestion!
Best regards,
Ronald