Adding additional ports to scan

I am running nessus version 2.2.0 on Fedora Core 1.  My question is that I 
would like to add additional ports to check during a scanning phase (i.e. Prefs 
or Scan option tabs).  The ports that I want to add are in the hundreds, so I 
don't want to just manually add them to the section that allows you to add 
additional ports.  I have found the services.tcp and services.udp file in 
/usr/local/var/nessus file.  I see how I could easily add them to the 
services.txt file, but I know that I would have to add them to the binary files 
(services.tcp and services.udp file), but I am not sure how to do that.  I can 
read the file with strings, but am not familiar enough with *nix to append to 
the file and then I guess recompile???  Thanks in advance for any help that is 
provided.

mark 
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