Flame or Fire aspect enchantment ideas

Ok, I know this might be a little overpowered so I think you could make it a new very rare enchantment if you have too, but what if you could put the flame enchantment on a pickaxe and it auto smelts gold, copper and iron, and before you think I am forgetting ancient debris that has survived the heat of the nether so it wouldn’t quite make sense, anyone is allowed to put there ideas in the comments, can’t wait for your ideas!