MoreCraftableBlocks

MoreCraftableBlocks enables the crafting of stone double slabs (item ID 43₆) in SMP. 6 double slabs are crafted by stone in the following order, where s is stone, and x is empty:
sss
sss
xxx

Or: 1 double slab with two normal slabs, where s is slab and x is empty:
sxx
sxx
xxx

It also enables the player to duplicate books.