Can you hack a zeno to use charges beyond the limit?

yes, when you press the button to warm up the zeno and it reaches the ultimate heat and beeps just let it run without hitting the button for the timer to begin, then when it shuts off hit the button again to warm up the zeno- basically it wont count these charges, you dont have the added benefit of the timer and will have to repeat this process about 4 times to gety the 2 minutes you want but it wont coutn charges against you- I have been using mine for over a year doing this- it seems the same temp wise to me- probably not perfect but it meats buying 30 dollar refills.