Feature request name
Cooked Entity Drops

Feature request description
A drop function that replaces an existing item from an entity's drops with another assuming the mob dies by fire.

Feature request reason
The drops functionality seems incomplete without a more simple method to do this.

Feature request dependencies
I don't think so. The functionality exists within vanilla when killing mobs with fire, such as cows, pigs, and chickens.

You can use the damage source given from the EntityLivingDeathEvent to determine if it was killed by fire, and drop different items.