If you want it (and you're not using the Russian version), you can do several things to enable it, IL2Stab and IL2 Mat Manager work but I've found them cumbersome to install and use. An easy quick way to enable it is to DL this little proggy:
http://www.mission4today.com/index.p...etails&id=3530
run it and let it run in the background. It's not perfect, but it's light, quick and easy.