Great Reading- Thank You Mr. Bonkers

I leave my Zero plugged in all the time. I believe the Zero engineers have designed the charger to not overcharge. That 100% is not really 100%- that it is a value that in no way compromises the longevity of the cells.
But if Burton's comments about over 4 volts are helpful, then where does that leave our 'leave it plugged in' strategy?
I guess my question is- How do we program our MBB (Main Bike Board) to shut off at say 98%? Is this too far off topic for this thread? Reprogramming sounds quite 'techy'. But I would certainly enjoy learning more. Are there any threads that have this covered? Thanks