Tomtom really does not work properly on wince 6, but the problems you have with iGO are easily solved.
1 Postcodes (in the UK) go in the city/town box in this format AA11 1AA, note the space, they are in the maps themselves and do not need any new files.
2 Speedcams, you just need an up to date Speedcam.txt installed, try here...
http://www.navitotal.com/forumdisplay.php?84-Languages-voices-speedcamsAnd place it in the ..\content\speedcam folder, create it if it doesn't exist, restart iGO to build it's database, this will take a few seconds, but it only happens once...