I found FOP when searching a possibility for setting up a pdf-servlet-server.
Like almost all of us, i also want to use form fields in my pdf's. Unfortunately i was not able to integrate your changes in the 0.20.3 or 0.20.4rc version of FOP, obviously there's missing the 'addField'-method of PDFAnnotList and i wouldn't know how to handle a FieldList, if i inserted one.
Have you (or anyone) yet used the above mentioned versions? Maybe i made another mistake when adapting the code into 0.20.4, any help would be appreciated.