Ok I think there should be some new mobs for /d and all you guys have for the nether is the blaze so i think there should be more:  

skeleton and wither skeleton

I think they should come together as tehy are so similar and I'm amazed you can't /d as a skele

Zombie Pigman

everyone's favorite pig!

Ghast maybe?

I'm saying maybe because idk if the disguises make the mob noises because if they do you wouldnt want a ghast

Magma Cube:

I'm thinking this should be bundled with the slime as they are very similar

And last but not least..

THE WITHER!!!

Ok being able to disguise as this thing would be awesome! I mean its the WITHER! Who wouldn't want to disguise as it? It's so awesome...

And those are some mobs I think you guys should add to the salami stuff to buy

Not a bad idea jawshy

SNEAKY SHIT GHAST DISGUISE FTW

xD

Hahaha.

New mob!

So stylish!

So cool!

SO SNEAKY!

And last, but certainly not least, ....

SO

FREAKING

AWESOME!

yey peoplez like ma ideaz

Coolio v.v

I like the idea but, With the Wither and Ghast and maybe the Magma cube, I don't they'd be added. Due to the size and the amount of people thay would buy it and disguise as it, There's a chance on the Server lagging then crashing. I could be wrong but I don't think anyone would take that chance on Me being wrong or not.

I was thinking the same thing about the ghast

The only reason I mentioned those is cause I've disguised as a ghast and wither