Can you please let me click the red box to turn smart cast on and off? Please?
http://i.imgur.com/QkjflSB.jpg

Amen to that.

One issue with this...If you accidentally clicked the box, but didn't realize it, it would be darn-near impossible to figure out what you did wrong and how to fix it.

I used to have this problem a lot if I started typing without hitting 'Enter' first, and ended up locking camera view, or changing the life-bar displays, or other tiny UI things that can have a big impact on your ability to play.