Batter out of the box...

[lawump]

This is all but ignored on the professional level...unless its really, really blatant.

Now, as an amateur umpire, I don't even begin to think about calling it unless I'm getting complaints, or there is a very, very blatant violation (i.e. a batter clearly runs well outside of the box in an attempt to bunt a pitched ball).

Don't go looking for these calls, IMO. That's how I handle it.