I noticed in data.lua you hardcode the quality multipliers. Would there be a way to do it procedurally thus allowing for additional qualities?

I added the Mythic Quality mod, the one with the cyan icon (not the half moon) and as I understand it this mod wouldn't see the new level.

I suppose it's possible, but as it stands the main reason I wouldn't intend to do it is because of the same reason mentioned in a previous thread. For each quality, I'd have to implement a whole new entity for it (because Wube does not expose a better way to do it), which causes the mod to add exponentially more entities. This is especially problematic for mods that add infinite quality levels, as I would need to add an infinite amount of entities.