1. Dynamic change of model while using modify panel like Edit motion layer or face key or Reach target etc. just clicking some extra button or checkbox provided (Legacy vs. Dynamic change). It is possible in Blender during pose mode clicking alt + Q and unchecking Lock object mode. In iClone it is not possible. You have to first released from whatever modification you are using and then click another model and then apply same modify criteria. It is harming the flow of animator and wasting time.
2. Introducing some basic mesh modifiers and active morph Editor to work in sync with each other during creating morph inside Character Creator for models and accessories. Every time we have to use Blender or Zbrush for creating simple morph and that time consuming.
3. Direct introduction of Sbsar (Substance Material) in cloth, hair or model with drag and drop just we can in Unreal Engine with Substance Plugins.
4. Introduction of AI physics in iClone keyframe animation just like Cascaduer.
5. Special provision (panel) for rotoscope animation in iClone so that reference video could be attached and rotated if we rotate the camera for animation convenience.
6. Make much simplified Livelink to Unreal Engine than present resource hungry procedure LiveLink. Mr. Soupday made an wonderful livelink for Blender which much effective, simplified and less resource hungry than UE LiveLink.