I've never made an issue of the one-foot-in-the-box deal as a literal point to be made with players or coaches. I have always considered it (correctly, I think) as a game-management rule to keep things moving.
If a team likes to conduct these little walks halfway to 3rd coaching sessions between pitches, I will start with saying, "Let's go batter." That usually does the trick. After all, I don't really care about where they keep their feet, only that they don't waste time.
If that doesn't do the trick, I will get louder, "LET"S GO, BATTER"!
Rarely have I had to resort to anything more punitive, but the next step would be asking the coach if he wants TIME for a conference.
Frankly, I find the arm band multi-color signal encyclopedias everyone seems to be using these days to be much more of a time waster. I had a team yesterday that had a multiple page arm band, where the players would have to open the thing up to find the signal.
Had another team a week ago where the coach would relay the pitch signal to the catcher, the catcher would signal the pitcher, the pitcher would stare at her arm band for a few seconds, and then finally prepare to pitch. On the bright side, there were no quick pitches! 😀
And, both of these were 16 or 18 year olds!
But, jeez... how may nuances does a team need for softball signals?