1)More controls over lights like strength shape_spot lights) and be able to contol them in game woth scripts or other methods
2)Importing multimaterial objects
3)importing meshes with parent constraints for example i have a car the wheells are seperate messes but they are parented to the main body and act as a single entity
4)the ability to change the properties collision etc of an entity after its been imported.
5)A way to disable sunlight
6)improve bloom performance never seen a bloom effect eating so mutch resources
7)be a able to configure animation and Ai actions through logick bricks or something
8)a simple material editing tool
9)fully Suport the .fbx format
10)more 3rd person setings like shoulder cam etc.
11)make it more friendly for importing new assets.
Its great engine overall but i think is missing some key features