You only can scroll with the mouse at the navigation map, strange that you had a CTD?
Try this:
Open the command_en file and find block 71;
change to:
[Cmd71]
Name=Cam_zoom_out
Ctxt=1
Key0=0x09,c,"CTRL Tab"
Or use SetKeys:
http://www.subsim.com/radioroom/down...o=file&id=1016
Also you can download the previous version
here. Slightly different but works perfectly.
Good Luck!