Whenever you press V you will shoot a ghast fireball that explodes instead of a fire charge that lit someone or something on fire. It would also be nice that there would be a cool down limit after shooting 3 fire charges just like the original blazes have.

I switched blaze to non explosive fireballs, but haven't added the cooldown yet. Morph balancing and survival friendliness is going to be added in 1.2.

I'll reopen this issue when I'll get started working on 1.2 update of Metamorph