One umpire's perspective:
There's no point in the catcher or coach or fans saying anything about crowding to the umpire. It's not like we don't notice when there's no view of the pitcher's release point from the normal slot position.
If the batter assumes a legal stance, there's nothing for me to say or do other than to observe the play.
There's no prohibition against hanging over the plate.
There is also no prohibition against the pitcher using the entire strike zone.
If the pitcher chooses not to pitch to the inside portion of the plate, that is his choice, not mine. I am neither more or less inclined to call a strike on either edge because of the batter's position.
The only difference I am aware of in my officiating when the batter crowds the plate is that I have a slightly higher expectation of agility on the part of batters who choose to stand close to the plate when I make a determination as to whether the batter permitted the pitch to hit him and will be awarded first base.
So far this season, I have called one batter out for bunting the ball while one foot was planted entirely outside the box (by a lot), and I have kept three or four batters in the box after being hit by pitches.
I'm not clear on what happened with the double steal, so I have no idea if interference should have been called on that play, but intent is not part of the decision.