Hi aternos! Good day! 
Can you please add "Better Slabs Mod"?
Link: https://minecraft.curseforge.com/projects/better-slabs-mod
Description: Is very simple
This mod adds slabs from all types of blocks in the game.
It also adds more functionality to them:
- slabs can be placed vertically, 'on axis' and on slopes
- slabs from directional blocks (logs, hay bales, etc.) can be placed accordingly
Blocks like furnaces do not have their slab variants
Special functions (like grass spreading) also apply to slabs.
Thanks! See you next time! 
