Sorry for the delayed answer, but maybe you can still use it.
After the 1st run dialog, these keys are written to the TextWrangler
preferences file:
<key>Services:FirstRunDialogVersion</key>
<integer>1</integer>
<key>Services:FirstRunOpenedManualVersion</key>
<integer>1</integer>
I'm not sure how you're deploying, but you could copy a configured
preferences file to each machine, or use the "defaults" tool to write
to the preference files.
If you're in a NetInfo style environment, I think you could just add
those keys to the Network domain preference file, but I'm a little
rusty on network management, so I'm not positive about that.
Steve