Using flint and steel/fire charge to directly light animals on fire

Normally you have to break the grass below the mob to light them on fire, then killing them to collect cooked food. It would be much more simple and a quality of life change to simply be able to light the mob on fire directly. If not this, then perhaps make it where the flint and steel/fire charge can light the grass on fire and therefore the mob if it is standing in grass.