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In previous morph mods, I was able to acquire the abilities of certain mobs, including their special attacks like Ghast's fire ball and Blaze's fire shot. I can only do the basics in this mod.
Also, I would use the morphs as a disguise to not get attacked by hostile mobs. This doesn't seem to be the case here either.
Please advise.

You can already shoot Fireballs as a Ghast. Take a look at the wiki for details. Moreover, hostile mobs attack you if they "see" how you morphed. Try morphing into a zombie, and then going near another one. As long as you don't try to interact with another hostile mob, they'll stay neutral. To disable that you can trigger them, set playerCanTriggerHostiles in the walkers.json5 to false.