I think there is a script for jewel array or array gem command, so you can array the tiles over the dome surface on each correct line.

i did a basic search but couldn't find it, but there must be somewhere here in the forum.

**Edit: founded, look here for ArrayGem command: http://moi3d.com/2.0/docs/moi_command_reference10.htm
just set up a shortcut key on your options
Luis G.