would be nice to have a feature to start optimizing an archive
convert GIF, BMP, PNG8 aso -> PNG and optimize it with oXiPNG or guetzli (free from google)
convert JPEG, PNG24 aso -> WebP
repack the images into a 7zip (cb7) without compression (zero-, savemode, only headercompression)
or convert all images into a animated WebP (not CB-archive) with zero timing
it should have a own page on config
and should be open for future formats similar HEIF (follower of JPEG2000) or AVIF (follower of WebP)