You have 2-3 and 3-2 zones to focus on inside or outside, with 1-3-1 being the extreme outside focused defense, so why not add box-and-one for games where you want to focus extremely on inside defense?
The box-and-one (
http://en.wikipedia.org/wiki/Box-and-one_defense) is not to focus on inside defense. The box-and-one has four men playing zone ("the box") and one playing playing man defense against the offensive teams best scorer. It seeks to shut down the best player on the offense...he could be a post player, but also he could be a wing player.
In order to implement it, you'd need to select the defense and then the defender and scorer to match up man-to-man.
Which brings me to something that I've mentioned before -- were does BB needs to go. Basketball is a game of match-ups and ultimately, you'd like to allocated defenders to guard certain players on the other team, rather than have the PG guard the PG, SG guard the SG etc.
Steve
Bruins