http://iscoresports.com/

Had a situation where a batter was called out for stepping on the plate during a bunt attempt. I scored it as Runner Interference on the Catcher and made a note in the pitch-by-pitch.
Is there a better was to score this so that it is easier to read on the scorebook?

Our next release specifically has an "Out of Box" option as a way of making an out. For now, what you did should be just fine.