In a message dated 5/28/99 9:12:05 AM Pacific Daylight Time, 
rcarson@user2.mnsinc.com writes:

        Other possible restrictions: it might be wise to suppose that
 Ranma can't change the past, and can't kill people. These would seem
 like natural restrictions to put on an imprisoned djinn.

I'd also suggest that Ranma-djinn isn't able to affect peoples thoughts... 
(IE is NOT able to make someone fall in love / out of love) as this sort of 
thing would have been badly abused in the past, and would be to solve to many 
Ranma-esqe problems that we've seen in the past.  Then again, those effects 
WOULD go away the next time Ranma-jin got doused with hot water, wouldnt it? 
Heh.  Heh.  HEH!

The more I think about it, there's a way to create even more chaos...  while 
not truly covered in cannon material, its been exposited greatly in other 
sources that the curse makes one a water magnet, no?  well, Ranma-jin keeps 
attracting HOT water the way Ranma-kun does COLD water...  thus creating 
situations where wishes cut off at the most inopertune moments...