Here some ideas I don't recall being suggested before. How about more interactive items for characters to use, such as...
Paranormal Gear: EMF Detector that gets stronger readings the closer you get to an enemy.
A night vision set. Say a HUD that not only give a "night vision look", but create entities that don't appear unless you have the night vision going. These entities would still be there. but you cant see them without the night vision.
Over all a nifty paranormal pack.
A wider range of pick up items. Herbs, Books, gems, cash.
There is so much that could be added to the system.
How about a twin blade pack. So you have a blade in each hand.
I could go on, NASA interior, White House interior, Complete Fast Food Restaurant set up, Post Office, Again these are all just thoughts.
Sorry for all the rambling.
Only in the imagination, can the truth be found...