Im busy working on his building called the Plickle (Yes, that is spelt right) and i need to make a table, if enabled on Config files for world-edit, the item "34" can be used. Id like this because it is a piston head without the pushy bit, and makes for a perfect table.
It is disabled to prevent lag, because people could mass-worldedit them. You wil have to ask @BlueFusion12
The reason it isn't like world editing another block is because pistons are technically one block in two parts, so when you only have one half, the game keeps updating the block to see if it is part of a piston, powered or none powered, which would lag if it is mass-world edited, however worldediting just a few shouldn't be too bad. Again ask Blue