Adding the speed camera database is not too hard, you just have to follow the instructions and get yourself a copy of UltraISO.
Basically :
Modify the Speed camera database to be the correct format .ASC files.
Convert the .ASC files to URL and IDX files
Modify the ENG.LSC file
Replace or add the files to the DVD ISO image
You can find the full instructions here
Add Speed Cameras to Europe 2007.1 - X5world