Are you advocating flying an approach with one engine at idle, and using only the other engine for thrust & speed control, but using standard 2 engine approach technique & flaps? A single engine approach, or 2 engine approach, is IMHO about thrust available and not electrics & hydraulics etc. I assume they'd have the APU running, just in case. I can understand there is a different philosophy on a 4 pot to a 2 pot. I wonder why, with one engine operating at idle on any type, you would not apply OEI techniques.