Setsize command

I think Minecraft should have a command to change your size. This command would allow you to grow or shrink. The command could be something like this: /setsize @p grow/shrink 

The number at the end would decide how much you would grow or shrink.

This command could allow you to be able to walk through one block areas(possibly smaller) and have to walk through bigger areas depending on size. This would also change your perspective to seem higher up or lower down.