I've always felt that it would be good to have more than just a spherical Magnet Zone so I thought I'd try editing a PZ3 file to see if I could get others. I loaded a cube prop, added a magnet and saved the scene. Closed Poser then hand edited the PZ3. Where ever I found "ball" or "sphere" I changed it to "cone". The relevant lines now look like this:-

sphereZoneProp Mag Zone 1
{
storageOffset 0 0.3487 0
objFileGeom 0 0 :Runtime:geometries:props:cone.obj
}

sphereZoneProp Mag Zone 1
}
buildCone
}

Now I'm sure I have not got everything right but initial tests look promising. I do have the PZ3 if you want me to email it you but be warned I have had Poser lock up and force a hard reboot on me so try it at your own risk.