(Will add more to this as time goes on)

Q; Will you add (X) or (Y)?
A; Depends on several factors like; how difficult would it be, do I have permissions to use the assets, etc
If I have permission to use the assets I need and feel like it, I can add many things

Q; Why do the new heads have no customization?
A; Fallout 4 Limitation sadly, the game only allows one customizable head texture to be used - The "Default" one - In this case "PonySkinHeadAge00", Remapping the UVs for the new meshes would take a lot of time and likely wouldn't look ideal - also the textures need to be the same resolution (1024x1024 by default)

Q; Can these be used on NPCs?
A; Yes, just like the other Pony race mods, All you need to do is set CMark.esp as a master file for your patch and add what you want to your NPC
NOTE: CMark.esp is not labeled as an esm, therefore using creation kit to create an NPC patch will likely not work, use xEdit