Hello! I'm Jadturentale,i actually will list some of my suggestions that could make Mine-imator better. You don't NEED to add these,these are just suggestions.
Motion Capture support (Adding Mocap Kinect/Camera capture,that will help to make great animations)
FBX Importer: Import FBX's,and have them work with the Minecraft characters.
Endorphin Simulation Support: Use Endorphin project (.els) or other stuff to get them work with Minecraft characters!
Transform tool: Move things easily!
Round edges: Opitional setting that makes the edges of characters,blocks etc. round,like in some animations.
Ability to toggle bend styles: You know,that wierd bending? Some people will want to have that bend style off and have the normal one.
Normal Maps and Parralax Occlusion Mapping support: Support for resource packs that have POM,PBR and Normal Maps,when the render is active.
Skin Maker: Make skins in the program without quitting it.
Minecraft generation Schematics: Use of things generated in Minecraft's worlds as schematics in the Schematics folder.
Custom Item Maker: Make custom item textures without quitting Mine Imator.
Basic Texture Packs: Texture Packs that are in all projects that you can choose without downloading and dragging stuff with file explorer.
Render Updates:
POM,PBR and Normal Map support
In settings,some more render options
Optimization
Making that the lightning looks like a kind of bullet going in the walls,like in real life and in Unreal Engine 4,example video on modded Roblox (I havent made it):
Aaaand water reflections,and lens flares.
Yup,that's a bunch of suggestions. I'd be happy to see that in 1.2.0!