Aside from temperature issues and the risk of takeoff on a single engine, no reason why you can't taxi on a single engine. Regarding temperature, I often taxi out on only the front engine in Nassau, when I see a long line of airplanes taxiing ahead of me and the tower comm suggests many inbound. And of course it's always hot. So the heat and the wait simply don't permit for the rear engine to be on. I wait until I'm second for take-off to start the rear engine and my reminder is that I never do the pre-flight 1800 RPM checks on either engine until then, until both are running and I'm at the head of the line.
Ernie
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