To stop the notepad informing you that you went over a ship, the English.cfg (and German etc) was edited to remove the ship class names, so for example, Type0=Patrol Craft was changed to Type0=-
This causes the Mission Editor to not have the 'generic Ship Class' option for use in the random group selection.
So instead of having a Generic Battleship, Generic Fleet Carrier, Generic Destroyer, Generic Cruiser and so on, you will only get a single entry Generic.
Images....
With Generic Ship Class -
http://img80.imageshack.us/img80/7729/image18qc.jpg
Without Generic Ship Class -
http://img233.imageshack.us/my.php?image=image28iz.jpg
So for editing, just have a copy of the file, drop it in when you are editing and drop the other one back when playing.
In this file, this...
;Warships
Type0=Patrol Craft
Type1=Corvette
Type2=Frigate
Type3=Destroyer Escort
Type4=Destroyer
Type5=Minesweeper
Type6=Light Cruiser
Type7=Heavy Cruiser
Type8=Escort Carrier
Type9=Fleet Carrier
Type10=Battlecruiser
Type11=Battleship
Type12=Minelayer
Type13=Auxiliary Cruiser
Has been changed to this
;Warships
Type0=-
Type1=-
Type2=-
Type3=-
Type4=-
Type5=-
Type6=-
Type7=-
Type8=-
Type9=-
Type10=-
Type11=-
Type12=-
Type13=-