Is there a way to change or add functionality to the hardwarekeys of a F900BT unit?

 

I would like to use the UP and DOWN functions of the joystick to start external applications while on the navigation screen of the AVIC software. This can be done by adding: "15 START_APPLICATION "Application.exe" """ command in the IGO scripts somewhere. Like described in this thread:

 

viewtopic.php?f=34&t=25223&p=171106&hilit=resinfo#p171106

 

However, I don't know which scripts are used to perform the normal UP and DOWN functions of the Joystick. It seems that the map tilts or zooms in and out.

 

Does someone know what I need to modify?