Yes it's now possible mate, your need to make an image of you disc and then open it with Ultraiso (or similar), then drag and drop the main carinDB file out and then follow the POIson instructions for adding cameras to the DB, then drag and drop the now modded carinDB back into the image, then save.

Then burn a cd and put in you drive, you then select the military bases and you get the tank icon on screen, these are the speed cameras, not ideal but better than nothing.

If you are handy then you can edit the text (in the OS) and have it say speed cameras (instead of military bases), as yet there is no way to edit/replace the icon as it uses a built in one that can't be replaced (yet).

BTW nightmode is available for the mk3 now, this has the modded text for cameras.

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Sept 03, M3, Silver Grey. Retro-fits: Modded Mk4 DVD Drive, OEM Bluetooth, VR Control, Rainbow Speaker Upgrade, Sony SOT Amp, HK Sub, CCFL, Intravee II, NightMode.