The better biome blend mod allows you to set an extremely high biome blend radius from in-game and uses a faster color blending algorithm. Currently, when used with Sodium, Sodium overwrites it.

Mod link: https://www.curseforge.com/minecraft/mc-mods/better-biome-blend

Sodium already optimizes the biome blend algorithm to be much faster, so the bulk of this mod would be redundant.

Isn't BBB's algorithm faster than sodium's?

Sodium already optimizes the biome blend algorithm to be much faster, so the bulk of this mod would be redundant.
Allowing the setting to be raised further doesn't seem like a good fit for sodium itself, but this should be very simple for an external mod to add once #75 is implemented.