Here are a list of some of the available command line arguments available for Driver: Parallel Lines.
Start "Driver: Parallel Lines" with Windows Media Center compatibility, switching the game to full screen and restarts Media Center (if available) after the client is closed.
This is the only command line argument I can find at the moment however I'm sure there are many others and maybe even a developer command line argument which will gain us access to the developer menu. If you know of anymore command line arguments please reply saying what it is and why it does. So I can add it to the list of Command Line Arguments.
I contacted UBI SUPPORT about the developer mode and got the following reply
Ubisoft Technical Support wrote: Hello,After further contacting Ubisoft Technical Support about the issue they gave me the following reply.
There is no developer mode within the game, closest thing to this are the cheat codes available online.
Ubisoft Technical Support
Hello Madness,This is pretty much the opposite to the last reply, so most likely there are command line arguments or in their case command line switches and we need to bring it upon ourselves to find it.
In this case the command line switches are only designed for development use. These are not listed or made available to the public.
Ubisoft Technical Support.