I've mentioned my dissatisfaction with the standard Luck rules in DCC RPG and how I think fleeting Luck is a vast improvement (q.v.), but I can't shake this feeling that the Luck attribute itself needs to be modified. The simplest thing to do would be to allow Luck to regenerate for all classes. For thieves and halflings (and other classes in MCC RPG), the rules would remain unchanged, but all other classes would regenerate spent Luck at the same rate as spellburned attributes: 1 point per day. The only other solution I would consider would be to eliminate Luck as an attribute. Just pluck it right out and let luck reside where it truly always has in every roll of the dice.