Pick Block with Mushroom blocks

When using the pick block button on a HUGEMUSHROOM block, (Like item id 99 and 100) you only get a mushroom. In creative this is very frustrating, Im using a texture pack that uses the data values for these blocks to have extra blocks.
Can you guys change it so you receive the actual block with the same damage when you pick block a mushroom?

(Eg: 99:7 or 100:5 etc)