Replace Mode
The Replace Mode capability allows you to right-click to replace the targeted block with the held block. This allows you to easily replace a large amount of blocks by holding the right-mouse button.
Additionally, when you replace a block, the newly placed block will inherit the properties of the old block.
A basic demonstration of Replace Mode can be found below
Type Replace
Type Replace can be toggled on through the Options Toolbox in the Alt Menu. Turning this on allows you to hold a base material block (eg. Spruce Planks) to replace stairs/slabs/walls/fences/etc. with their spruce variant
A demonstration of Type Replace can be found below