Happy ghasts must shoot fireballs

A ghast is a flying hosile mob that is found in the nether. It can shoot or throw fireballs to a player. The happy ghast must also have this ability because they are both ghasts. This feature is very useful in different ways, like mining, killing hostile mobs, etc. Once a player rides in a happy ghast, it should have a fire button for the happy ghast to shoot fire manually. I wish that Mojang add this feature at the future updates.