Correct, O2 sensor off during tuning. The BOV will create a rich condition between shifts and possibly decel as metered air will be escaping the system and the ECU has no way to know this.
The WAR Chip program should not have issues with the values entering properly, HOWEVER, if you do experience it, the up and down arrows always work as designed. If you need to make big changes, you can enter a value in the box beside the purple buttons and each "click" will increase the cell(s) by that amount instead of 1 increment at a time.