Bitterman, what FC99 is saying is correct. In 2008, a few community members did hack the core of the game and found a way to run 3rd party mods. Today there is still a thriving modding community and in fact, a few members of DT initially started at modders. Most of the mod packs run off an Il-2 1946 install patched to 4.101m.
In respect to the forum rules here, I will not post any links, but there is a discussion section about Il-2 mods here:
http://forum.1cpublishing.eu/forumdisplay.php?f=201
Hope that helps
