A port of the Ironman Second Wind addon, allowing you to specify an amount of lives per ironman playthrough as well as grant the ability to earn new lives over time.
UPDATE 1.1: modified the script so you get notified of each new life gained
All credits to Alundaio and Tronex for originally creating the addon - I've just ported it to COTZ.
To change the settings, go to configs/plugins/ironman.ltx and edit the values stored there. These values allow you to specify whether you want more lives at start or the ability to earn new lives by surviving a specified amount of in-game hours (outside of sleeping).
To install, drag and drop the gamedata folder into your COTZ folder. The default settings start you off with one life, but you will earn new ones every 48 hours.