Gravity plane alternatives

Part of my recent spelljammer game was to change gravity to be generated  
by the helm.  This has obvious implications for sargasso's, as well as for  
small asteroids that wouldn't necessarily have their own gravity.  It does  
however solve a lot of the problems involved in space travel.  The way the  
system works is that all things have gravity in the basic sense.  Part of  
the job of the helm is to be a focus for all of this gravity.  The helm  
splits the gravity along a plane and thereby brings it to a nice even  
constant amount.  This functions even when the helm is not manned, and can  
be replicated be some simple magic items.  The process of aligning the  
gravity on a ship during when the first helm is installed takes quite a  
few hours.  Aligning the gravity of an asteroid like the Rock of Bral  
could take days or even weeks.  The time to become unaligned is equally  
long so it is quite simple to swap a helm, but to install a new helm on a  
derelict takes a while.
So what big problems have I missed?

-
Sledge
-