For the pocket dial, make sure your phone locks when the screen goes off.
Check screen time out and smart lock
"There needs to be an option to remove the emergency call button from the unlock screen. "
Federal law mandates that anyone be able to make a 911 call from any phone whether it is locked or not. So you won't see this removed.
"Second issue is the power off icon now only shows while the pulldown menu is pulled halfway down"
You can see it when you swipe down with 2 fingers OR swipe down twice with 1 finger.