If you take the power from Amp-Remote, then it will only be active when the screen is on.

I wonder whether anyone would have heat issues when the unit is in standby? I don't know how much less heat would be generated by the empeg in standby, but I believe that most of peoples' heat issues are mainly caused by external factors anyway - eg, heating, or Head Unit with integrated Amp in close proximity.
I also wonder if Mark (or I guess I could look at it one day), could add the ability to specify different options for when in Normal and Standby modes, e.g. something like
fan-enable-on=1, H=40, L=38
fan-enable-off=1, H=50, L=45

Or do you mean that the fan is active even when the player is competely shut down? If that is the case then I'd suggest that the output stage of the circuit needs to be switched by the RA line.