Checklist of things I think should be done, and will do if @holomorph doesn't:

• Remove now-superfluous getPfaEditDir() function
• Make auto-save and any similar directories invoke getFontForgeUserDir() with appropriate argument values
• Figure out whether there's a memory leak and if so, fix it (most likely by caching results)
• Make indentation match existing code
• At least a few code comments
• Namespace pollution issues
• Think about whether varargs may be a portability problem
• Think about backward compatibility
• Directory creation

Not something I plan to do, but someone should:

• User-visible documentation of where FontForge will put its files