I agree with the oil suggestion. If you had to coat your weapon in oil as an action and then ignite it on a bonus action next turn it'd be a lot more immersive and balanced at the same time.
This is what I would like to see too. Depending on manpower, there could be different 'dips' too (so a candle will only light something dipped in flammable oils, but an oil barrel's surface left after exploding can let you dip an arrowhead into it) but at the very least an 'economy' would be welcomed-placing and lighting the candle both costing actions (bonus and standard?)
