Question: 
Is it possible to Map Material in the Block? 
  
Why do I want that? Just made one block of stair, and copied them that I could do changes to all of them by one modify. 
  
I want to fix the wood material map in that Block 
 
  
EDIT: 
Found a way how to rotate material, by rotating object by 90, add material again, and rotate 90 it back 
  
I wonder is it possible to bypass those blocked command in Block?