Placing buildings from Blueprints

I would like to make the suggestion that when placing a building blueprint on the ground could we please have the blueprint actually rotate a full 360 degrees on the z axis (rotating) instead of 90 degree incriments. It may already be able to be done but I do not see how I can do this if it can, can someone please tell me how you stop it just turning 90 degrees every time. thanks

 

Used to be able to but this was changed to allow the AI to function properly.

 

Thanks for the answer a lil disappointing that you can't but if the AI won't work correctly nothing can be done about that then atm.