From what I have noticed, if you got "wemod" running in the background.
Modern Warfare refuses to be up and running at the same time.
I am not exactly sure how wemod runs, but I would hazard a guess it is using the old cheat-engine system like the older trainers used to do so.
To which extent, it is likely just as impossible due to the Anti-Cheat with Modern Warfare.
However, you would also have to take into account that without internet connection. You can't actually play Modern Warfare on the Computer. It requires an active connection to blizzard/battle.net.
Yet, if MrAntifun can get it done, it would be brilliant if possible.
+1