Guys I don't want to be boring but I would really suggest for anyone who is intrested in to follow the procedure that I described. You will notice the difference directly to the first convoy you will intercept, even in GWX. You will see many types of merchants that you have installed! In 2-3 convoys you will have met all of them!
Phoenix be careful! Dont do it manualy. Use the menu Replace-With of the "Edit". The "With" box live it blank!This will replace the entire 2nd raw which designates the class, with a completley empty one. For the game code that empty line does not exist and jumps to the third line which designates the type exactly as the original generic ships of the game in which the line of the type is 2nd instead of 3rd with no class line at all! The Replace-With function will help you do it once and for all for every class that you choose, thus not having to do it manually searching all the RND file for KSSs, KLSs etc
A tip: If you want the extremelly beautiful Norfolk type Heavy Cruiser to appear in your game, change its designation "type=7" to "type=6" in both .cfg files of Roster and Sea folder. The game has no prediction (which is normal) for british heavy cruisers "7" but only for light cruisers "6" in both RND/SCR files.