More costumizable world options

I would love to see more options for customizing the world other than superflat, amplified, large biomes, and single biomes. If we could get an option that gives us more control over how our worlds generate it could make for some really fun world starts. First off, it would be nice to be able to customize the individual biome's sizes and generation frequency within the world. I often wish we could have bigger oceans that encompass the land to make continents. Perhaps we could change the sea level height and depth as well making for deeper and bigger oceans. I'd also love to have an option to choose a starting biome as it's always a roll of the dice if I get a biome I like when starting a new world. I miss some of the older features that gave the option of generating a cave world or a floating islands world. A separate world generation type called "custom" or something could enable a place for these features without removing the default. Perhaps some sliders or toggles for the size and frequency of each biome. Even the density and frequency of structures like villages or outposts could be set on a slidder or toggle. There could be a button besides each biome for if you'd like world spawn to be in that biome. Overall, I think this kind of customization could help players with costumizing their survival experiences to their liking, and help map makers by giving them a better start for their terraforming. Though I know this all is easier said than done, so thank you for reading.