Make iPhone apps think no external monitor connected How can I make iPhone apps think that no external display is connected?

I am using a 30-pin to A/V adapter, and an iPhone 4 GSM with 7.0.4 jailbroken.

I was hoping to use iFile to change a setting on the iPhone, but I'll try any solution.

Thank you for the help!
It Works!

I installed Flex per @AndrewLarsson and entered the name of the app that was detecting the external display.

I then went under UIKit, then searched UIScreen and returned pass-through on displayOut_actualScreens.

When I tested it with my AV adapter, the app did not know that there was an external display connected!

Many thanks to @AndrewLarsson for his help! Without it, I couldn't have figured it out.

UPDATE: False alarm. It wasn't working. I had gotten overly excited and missed the fact that IT DIDN'T WORK!!! I'm really sorry about that...