NPPVpluginWantsAllNetworkStreams fails to work for Out-of-process-plugins

One of our plugins in use requires that
NPPVpluginWantsAllNetworkStreams work due to the fact that web-service
responses are paired with 500 error codes and we need the response
data to communicate details.

We have discovered this recently on 4.0.1 of Firefox since that
enables OOPP by default and we hadn't been testing our error cases on
4.0 (we had been strongly testing error cases in 3.6).

Is there an easy way to mark our plugin as not compatible with OOPP or
what is the probability that NNPVpluginWantsAllNetworkStreams can be
enabled in the near future (4.0.2) over OOPP?

Looking through mechanisms for our system-installed software to put
this in, we could use a global preference javascript and add ourselves
to the blacklist that way... or we could use the global environment
variable to disable OOPP.  Are there any other ways or examples of
working around this limitation?