This is probably out of the scope of this mod, since this mod is focused around the far lands and high distances. However, the mod does remove the limit for the world border, so I figured it would make sense for it to remove another limit, namely the limits of the /effect command, so it can go from -2147483648 to 2147483647 instead of 0 to 255. Negative speed values could also help to investigate early effects of 64-bit floating point precision breakdown.

Not sure if 1.13+ would still allow such effects to work, but it'd be interesting to investigate if it still does.

See the mod linked in this video: https://youtu.be/PvUStAEeYd4

closing as the notice on this mod's readme has announced discontinuation for a while now - feel free to reopen in future if work starts again