compression quality toggle

[sweetrobot]

Feature Description

there should be a compression quality setting - perhaps walled being an "advanced" mode toggle, or some override via a hook in functions or something -sure that's possible currently, though i'm a novice in this regard.

this was prompted because the current compression on webp (and even far more on avif) is overly agressive, and, in our use case compromises too much detail (grainy textures become soft and blurry).