Re:Creating a Publishable Document from Wikis
Tiki already supports a 'PDF-export' function although I am not sure it would exactly what you want. Have a look at it and try it out. Look for the small PDF icon above each Wiki page. If you would like to see this functionality enhanced then you would be best to log an official RFE (Request for Enhancement) on the Sourceforge site.
Regards,
Pat.