Another very useful feature would be an specialty that sets that a creature doesnt collide with other creatures and plot objects. This would be great for flying creatures, ghosts and some weapons.
I could actually use this in a big way for my own mod because the default collision detection for creatures can cause havok on what I had to setup. I think this specialty should be configurable though, like you could set what plane it would not check, all or none. That way there could still be some collision detection.
Something I personally could use is a speciality that would allow creatures to backpedal in the same way the player can in vehicle mode even when they can't turn. I don't expect this anytime soon, but it could simply be set to negative speed values. So you could set the minimum to a negative, which would be the speed of the creature but moving backwards, without changing it current heading.