regarding adding an interface i was thinking the same thing during dinner just minutes before, so yes i think we'll do that
for the hook in, the piece im missing i think is where/which part of hibernate to i hook this into. ill look more into the generateFieldWriter later tonight, the only thing i remember it doing atm is check if the hibernate interceptor exists and then call writeObject or something.

another thing (and this is from not knowing anything about how its currently handled), but couldnt this also be used to find the fields needed when doing dynamic updates etc? perhaps we could create some logic in bytecode to handle that as well?