We use S-shape flanges quite often at work. I based the program after the C-shapes program in this forum. The geometry is basically the same as channels, except that one side is mirrored which makes the S-shape flange. The data is per the manual of Steel Construction. Please give it a try and let me know what you think.
Trevor
I've included an image from AutoCAD of typical S-shapes to show what the program draws.
Thanks for the input. That would really help new users figure out how to run the program. And sometimes the program is not even called the same name as the lsp filename. Thanks for testing also.