My wish list in no particular order:
1. Editable Splines
2. Ability to delete nodes using the delete key.
3. Ability to customize player controls (ie. remap keyboard to WASD, walk/strafe, mouse as point of view)
4. Fixing collisions with self in first person view when clicking entities.
5. Fixing collisions with environment in first person view.
6. Ability to animate player character using splines and markers during cinematics.
7. Access to code library.
8. Ability to use the same name for an object after its been deleted (most trouble is with splines when there not drawn correctly and can't edit them).
9. Undo in Scene Flow.(Ctl+Z, Ctl+Y)