The problem with GtkRadiant is that LOTS of prefs files are scattered in hidden places : the game description files in the game folder inside the bundle, the prefs files for each games (for radiant14: .radiant/1.4.0, .q3a for q3, .wolf for wolfenstein etc and for radiant15: .radiant/1.5.0) and I didn't want to mess with those locations which I didn't chose.
When the applications are moved and/or renamed, I decided (maybe a little too boldly) to have all the prefs files automatically recreated from scratch (the templates used are inside the bundle by the way).
Maybe I'll try and improve that method (first try to update the already existing prefs before creating new ones)...
Sorry for the inconvenience... my mistake....
