Enabling sign buffering reduces the quality of an HD TTF font, such as Roboto Bold.

Intended. The Buffer texture size is meant for vanilla/blocky fonts. Disable the sign buffering when playing with hd fonts.

Intended. The Buffer texture size is meant for vanilla/blocky fonts. Disable the sign buffering when playing with hd fonts.

Could this be documented in the mod description’s FAQ?

I can update the FAQ to clarify that some mod support/Forge/high-res texture packs are not planned and probably will never work.