Any chance the content of variables.scss could be translated to a $map?
This way we can easily loop through all the variables.
By using a $map in variables.scss you can replace all the classes in style.scss by one small @each loop.
(in our case that would save 1200 lines :))
I'd actually prefer the classes where generated in a separate file from the font generic stuff (font-face, font-style, ...).
That way we can easily exclude stuff we don't need.
style.scss (could import the other files so you still have one entrance)
_variables.scss (icons map)
_font.scss (embeded font)
_icons.scss (loop generating icon classes)
That way we can simply take what we need and skip/replace the rest.
At the moment it's all or nothing, which is a bit sad when offering sass.
With the above changes one could, for example, replace _icons.scss with their own version that does some additional stuff without having to open/edit the file each time you export a new icon set.