Okay Shipaddict, here's my custom .xml file.
http://www.sendspace.com/file/6vngme
Steer max degrees will be 75 instead of 35.
Engine power will be 125000 instead of 25000 (I think this is as fast as the power boat).
Name is Queen Mary 2 because my custom ship is called so xP.
I did not edit anything else.
Download that file, rightclick it and press "Cut", go to C:\Program Files\Vstep\ShipSim2006\Actors\act_dynamic_objects and paste the file there. It says there will be a file already called so, do you want to overwrite it? Say yes.
EDIT: IF YOU DON'T WANT TO KEEP THIS FOREVER, MAKE A BACKUP!
Do this by highlighting the Act_P6_Port_authorities_Custom.xml which was already in it, then pressing Ctrl + C and then Ctrl + V. A file named Copy of Act_P6_Port_authorities_Custom.xml will appear. THEN overwrite it. Place this copy somewhere else.
When you want the normal speed / steer max degrees back, remove the Copy of part in the name and place it back in the folder.
Then open the game, edit a mission, put your CUSTOM Port Authorities (not normal one) in it, save the mission and play
. Have fun.
People who do not know how to edit the file can ask me to edit it, I'll do that, or search through my posts, I explained how in one of them.