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?