[geoschmo]

Haven't tried it but I don't believe it would be possible. Black holes are not just a different kind of star. If you look at the systemtypes.txt file stars are objects, black hole systems have no objects. (except the glich where the game puts a planet in the system, but that not the same thing as the game is operating outside of the normal text file parameters when it inserts homeworlds.)

It may be possible to make a new system type which has in effect a black hole and a star in the center. You would just only see the black hole because you would use a blank bitmap for the star. I am not sure the game would allow that, but it's a facisnating idea.