Yeah, I have activated R&D mode with pwr_key. It's just that on my N900 without bme I sometimes forget to tell dsme that the charger is not connected, so instead of powering off it goes to some half-act-dead-but-not-quite-nirvana state, so when I turn it on again it doesn't quite know what to do (I think it gets bootstate = ACTDEAD even though pwr_key is forced) until it reboots again, this time with pwr_key/normal/USER bootstate.