Its not a mission generator, its mission editor, I posted a link in the Radar Mission Topic in this forum the last time ya asked.
I only use it to setup the mission, the rest of the stuff I add manually using notepad.. open up any of the missions I have made and posted here with notepad, you will see how the missions are structured.
The hardest part is getting positions, to do that ya gotta turn on the debugger so that coordinates are displayed.
When I first make the mission I remove all the waypoints and add a start position for a airbase I want to take off from, then I do alittle recon work flying around looking for places, pause the sim and write down the positions, this works good for waypoints.
Setting ground objects is alittle more complicated. I will take off and fly to an area that I want to place these objects in, then I crash the plane and use the mouse to zoom around the area and record the positions.
I then esc outta the mission and and go back to the start screen, alt+tab out and open the mission file with notepad and enter in the ground objects, 1 at a time, then save it and go back to SF and see how the ground object/waypoint looks.
Takes alittle while but I have gathered lots of stuff now, and it only a matter of copy/pasting.
I also had to use the extract utility to find the different ground objects that are available.
IF your interested in making missions this way let me know and I'll try and help ya.