A lot of people advocate leaving one's pump action shotgun in 'cruiser ready' or 'cruiser safe', which means that the chamber is empty, the mag tube is fully loaded, and the trigger has been pulled, so that you can just rack the shotgun to get a round into the tube and fight.
In my opinion, the step of pulling the trigger while the mag tube is loaded is unsafe and unnecessary. It eventually could lead to a negligent discharge if a round somehow found its way into the chamber due to inattention.
Regardless of the potential safety issues, I think it's preferable to train always hitting the action release lever the first time that you rack the bolt. That way, the bolt will come back whether or not it was locked forward. It doesn't take any significant extra time and is more reliable.
I had long had this opinion, but I was reminded of it recently in a Magpul Dynamics shotgun class where Chris Costa said something to the same effect.