No way to do that as far as I know.
I think you're out of luck on this approach. But think of this: why not output your data in another editable form? For example an Excel file? Or an export (CSV, text, etc.) that your distributor can import into his own spreadsheet or PDF layout program?
If PhilModJunk says it can't be done, then it doesn't look good for me.
Kevin...you'r idea is a good one, though I'm not sure my distributors have the skills to make this happen. I'll toy with it and see if I can export to something user friendly.
I'm sure it will prompt another question and if so I'll post to this thread.
It might make a cool feature in a future version: http://www.filemaker.com/company/contact/feature_request.html
Adobe Acrobat can be used to manually create such a PDF form so the technology for doing this exists--at least in theory...