Coming from element 3d to iclone there are a few wish lists....

1...Replicate, twist, morph.
If you had a character or object you could Replicate . Replicate on a plane. You could offset them x,y,z. Offset size, Offset rotation. Offset start animation (if soldiers are marching they wont be in perfect sync).
Be great for making crowd. Quick forest creation. scattering effects. Twist, bend, stretch, morph, all the usual lists to play with characters/objects

2...Camera tracking. Be on another level if you could have camera track points and mix real footage with iclone objects

3. An option to reduce LOD in character/object. Low res poly+texture for background characters.

4...Render out shadows. Be great if you could have track mat for shadows and do a render pass for shadows. Another option in IRAY.

5. One of my pet hates in iClone is camers. How about some camera shakes. maybe different default settings. Hand held. Fast n furious. horror chase. epic cinematic movements.