(Italic is copied from the Nostalgic Tweaks server, posted it like 2 years ago)
Since 1.19.4 changes the world creation screen, it would be a nice addition to change that so the old world creation screen can be brought back from pre-1.19.4. It would also be nice to be able to choose layouts from older versions as well e.g. Beta 1.7.3.
Essentially, I would want a port of https://modrinth.com/mod/timeless, plus the b1.7.3 create world screen. This would not only be great for old style modpacks on >1.20.4, but would likely also make implementing it into Nostalgic Tweaks (a massive mod that is kinda on hiatus) easier later down the road.