The second post in the Forum Guide for this Ideas/Suggestions sub-forum lists all the things the developers have specifically said the volunteer mods are not to send them as viable suggestions from the forum. Here's a link to that post:
What the devs have ruled out
Here's the explanation specific to rotating bldgs:
"
Rotating Buildings - For starters, this ability will take away from the essence of the game. Can you imagine how easy the game will become if we can simply rotate the buildings' like puzzle pieces to fit as we wish? Additionally, design-wise, it is not possible making this a definite
No."
The design-wise part may refer to the fact that the bldgs are 2D, not 3D. It would require a complete redesign of the game to make this suggestion work.