Revert XP loss on death to total exp?Suggestion

So I'm probably the only person in the world that is wanting this, but is it possible for me to revert ZLevels to the state where you loose XP based on your total XP, and not just your current level? If so, is this something that I can easily tweak? 

Basically, I want it so that higher levels will be very much out of reach without careful playing, and I want it that people respect their lives, and not just run into a gunfight because they have nothing to loose.

Cheers! :)

Just a quick bump, but I'm curious if anyone know what I must change on this plugin to remove on death from total exp rather than current levels. Any help is much appriciated.