Why this isn't already a thing is beyond me. Ched prolly meant to patch it in but forgot...sounds similar to another suggestion he said was going to go live but it never did...I can't seem to recall what the suggestion was though...
This change will be live on Tuesday so people are aware.
I am aware this will be unpopular but it also allows us more flexibility with how much we can give out refills too in the future in terms of compensating energy loss for various things.