1)Decrease the size of building, doodad and units
2)Decrease the attack range
3)Decrase the movement speed of units
4)Adjust the camera for proper zoom-in rate
An interesting idea. The biggest aplication that I see is to keep map size down. The problem being the amount of time it would take to shrink everything.
Have you tried this or did you just kinda think of it and post it?
But then that means you have to modify the shadow data so it doesn't look all messed, then you have the change the pathing map and collision size - too much work.