The only circumstances where the FDR can record data different to the crew is when the source data is ok, but the display system is faulty.
On 747-400, the FDR has a dedicated accelerometer in one of the main wheel wells. I assume the A330 has the same thing?
An FDR/CVR datadump system via Satcom should probably be independent of crew actions (but with a manual backup). Not only should it be able to transmit a record of past events, but current events, too (To me, that sounds like a lot of data being transmitted).
A datadump system would need all the components feeding the DFDR and CVR and the Satcom system to be electrically powered (IRU's, system busses, etc). Currently, many of these are on the main AC busses, so as soon as you lose these, the system becomes less than helpful. The alternative is battery power, but you really don't want these devices sucking up battery power if that's all you have left.
I find it odd that many aircraft don't have a low gain Satcom antenna system dedicated to data transmission, which doesn't rely on the power hungry high gain system (some of our Boeing aircraft have both, with the high gain system dedicated to voice and the low gain system dedicated to data ... unless the low gain system fails).
Rgds.
NSEU