No more shafts leading directly to the core, please.
And while your at it, make the force field a bit more difficult for Jedi infiltrators to turn off.
What do you mean? The Jedi are extinct Lord Vader so to that years ago.
"Can't you just gesture hypnotically and make him disappear?" "It does not work that way. RUN!" -- Hadji on metaphyics and Mandrake in "Johnny Quest"