TGC have been asked to comment on this previously recently as the issue is brought up consistently. Not many comments are forthcoming from TGC on features which users ask for, that does not seem to be the way it works. We all just have to wait and see.
As it stands fog does not and never has worked - it has never been included as a working feature - so we dont have it and should not expect to see it. FPSC is as it stands now until TGC decide to develop it further and we wont know if thats ever happening until theres an official announcement on FPSC future development if ones forthcoming. As we have no indication as to any timimg of any further development we wait and in my case at least just get on with it.
Workarounds if they can be found are not the real answer for many things as they rarely replace effectively inclusion into an engine of real features, however waiting for something that may never happen is a long procedure with no progress for your game.
Unfortunately one could concievably waste a lot of time trying to find workarounds to things that may eventually find their way into FPSC so if you have something you need and its not available you might be best getting on with those things you can do and go back to things later on and include them if and when available or workarounds are you only other option.
Certainly personally as I need so many things in my game that FPSC does not have or provide for by default I have so much to do creating a great deal of content including many workarounds that fog for instance for which there does not seem to be an easy workaround - if any at all - it can wait.
Fog never got implimented I guess as with many things because there was just not enough time to get the work done to include it. When beta testing V1 I never saw fog included - and no one had the time even to consider it - there were far more important show stopping issues that TGC had to concern themselves with. A whole raft of non critical issues and features some that users now speak of as wishing were included could not be addressed - to do so would have delayed the release of FPSC for an unspecified time period and that was commercially unacceptable to TGC and not wanted by many, perhaps the majority of EA users at the time too.
Heres wishing all the best for the future...