Doing the reverse engineered GMapTool/cGPSmapper to MapSource version of a "gmap****.img" gives a very poor MapSource solution. The preview map is blank until a high zoom level and the search function would be disabled for the map.
Guess that we want the real MapSource version of City Navigator Middle East NT 2011.x instead.
It's also possible to view the "gmapsupp.img" file directly in Garmin BaseCamp if it's stored on a memory card or other removable media.
For preview map., we can edit .TYP to change Zoom-in Zoom-out level.
But I am agree with you.., Mapsource version is better . :-))