What feature do you want to see added?

I have searched hours but i dont think this is a feature:
I tried to change the biome, but its in 3D, meaning it wont change from top to bottom of the world.
Is there a way to use a brush to both yaxis aswell up and down simultaneously?
Something like ''-100:100'' or use ''expand-vert''?

For example im using ''/brush cylinder $deep_ocean 5 100'', but the 100 will only apply from block to 100 blocks above it, and -100 will of course only do the block and 100 below.
So if you stand in the water you are in biome ''deep ocean'' but if you fly or just even jump around, it will still be the previous biome.

Is it possible to go both ways in the y axis?

Are there any alternatives?

having extra syntax like ''expand-vert'' or '':'' to have + and - directions in height.

Anything else?

No response