Well... hmm... no, I don't understand the question
Do you mean that site blowfish should configure the sitebot and everything by itself? Setting up blowfish support is really easy; you only have to add the key to ioBanana.tcl and that's it.
Or do you mean that site blowfish should display some text to the user? In this case, I recommend adding a new site command that displays a text file.
blowfish = !c:\ioftpd\text\ftp\blowfish.msg
Don't forget the permissions if you don't want all your users to be able to use this command.