File features: recent files list, numeric incremented save.
Edit prop in 3DX, apply to iClone option.
Custom 3DX face puppet option as Face Keys.
Motion layer to keyframes or reverse of Collect Keys.
Retime selected keys, match selected keys with motion duration stretching.
Shape emitter.
Bone to bone collision detection/avoidance.
Bone angle relative morphing. eg: Bend elbow = muscle bulge.
Onion skin with option to just view the skeletons to keep processing lightweight.
Simple automatic crowds.
Freehand drawn path.
Mute all button in timeline panel.
Sliding timeline markers with go to next/previous marker buttons on timeline.
Masking planes, shape hides only a selected prop or avatar that comes between the camera and the prop but nothing else.
Shape or color coded to identify transition curves type keyframes.
Hide or floating window message panel option.
Textures at 100% Strength as the default value.
Force zero on X and Y hip coordinates at all frames option when saving motion.
Remove from object: material keys, constraints keys, button.
Start simulation, physics, spring bones, particle emit, etc. have a start frame prior to start rendering frame.
Animatable bone stretching for spine or cartoon exaggeration.