Customizing FTP Response Code

Does any one know if it is possible to customize the FTP Response Codes that are used on the Serv-U MFT Server.

I want to change a variable for Response Code 250, but it seems that in order for me to do so, I have to go in all commands that have a reference to 250.

Is there a centralized file where I can make the change only once and have that change reflect to all other FTP command that are referencing it??

Thanks in advance for you reply and cooperation.