Easier Building

There’s a mod I really like called Clutter NoMore. It lets you change block shapes on the fly, between full blocks and their slab and stair variants if they have one. Then you can stack blocks, stairs and slabs of the same type and they merge into one block.

You’d press shift F while holding a block with slab stair variants to open a menu where you select block slab or stair.

This would make building way more faster and improve the inventory greatly.