Shifting into N at lights is a definite No,No in a hybrid and not recommended in an automatic either. In the hybrid it means the traction battery can't be recharged, if needed, by the engine. In an automatic it just causes unnecessary wear on the transmission shifter and 'box.
It took a while for me to get used to sitting in the car leaving it in the Ready state whilst listening to the radio etc.. Yes the DRLs are on but they draw minimal power, plus in the ready state one benefits from the a/c and heater. The engine will fire up now and again, depending on how long one sits there but it's much less in the summer (no cabin heat required), it's surprising how long the traction battery can power the stationary car. If one powers off and relies on the 12v battery one runs the risk of discharging it and not being able to restart the car. Or perhaps not locking it.
Hill Start on my RC is automatic, just come to a stop, the car will not roll back when taking one's foot off the brake and getting on the throttle. Not sure if that's the same with the RX though.