Hi. I'm not tested this (my G940 FF is editable without problem), but i read somewhere, that the FF files is compatible with old il-2 FF files (at least, the file names is the same). You can download medium and light files for il2-, so -in theory- it should work under clod too (edit - My mate confirmed, it working with CloD too).
You can download from here:
http://www.mission4today.com/index.p...etails&id=3656
and copy to there:
C:\Program Files (x86)\Steam\steamapps\common\il-2 sturmovik cliffs of dover\parts\core\FF
But an important thing: I don't know, the Steam VAC check these files, or not, so until BlackSix or anyone else don't confirm (i'm just asked BlackSix, maybe he know), please use it only offline (you change the system files, the Steam VAC may detect as "cheat" )