A lot of good sense coming from everybody!
I am personally using engine shutdown when taxing in.
I guess when can starting having a resume of the argument, respecting who prefers all engines running.
1. Crew discussion and briefing
2. Aircraft type (prop/jet, 2/3/4eng, ..)
3. Airport caracteristics (taxyway/ramp slope, ext./airbridge parking, Homebase, familiar airport, ...)
4. Time (for busy traffic, day/night ops, wet/dry, fog, ..)
5. Aircraft restrictions (see MEL/HIL for APU u/s, generators, indicators, ...)
6. Crew knowledge of SOPs (be prepared for corrective actions: PAX announcement if you lose elect.!, ATC,company frequency, ...)
7. int. left for yr comments!!!
Let's hope for our aviation moving up....
Cheers