#1. Modified from the bookshelves, books fall by breaking with the optional id. Example: id 340 books, and when broken shelves id 2837:7 falls book id 340:7 crafted that either impossible.
#2. If you put him on a semiblock another semiblock, then I will spend only one semiblock because second semiblock not subtracted from the inventory. Example: 3 block do in Marble workbench = 6 pcs slabs. Put the slabs on each other and get 5 pcs Marble block + 1 slabs. Increase in 2 block + 1 slab.
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#2. If you put him on a semiblock another semiblock, then I will spend only one semiblock because second semiblock not subtracted from the inventory. Example: 3 block do in Marble workbench = 6 pcs slabs. Put the slabs on each other and get 5 pcs Marble block + 1 slabs. Increase in 2 block + 1 slab.
Minecraft 1.6.4