Characters Playable After Death?

I've had this idea for a while and the other day Goji (Mheetu) contacted me with the same idea. So I have decided to have you guys give your input on it.

Should dead characters be able to come back as ghosts?

Here would be the limitations of the character;

• The character can only be in one thread at a time.
  
• The character stays the same age after their death.
  
• Characters can contact their loved ones through their dreams.
  
• After being in one thread the spirit would have to gain energy once more and wouldn't be able to played with for a week after the thread finishes. (This doesn't mean one post a week, just one thread a week)
  
• When not in a dream the character cannot speak to living characters, only make appearances and give nods

Now if you have more limitations that you would like to see added just reply here!