I am familiar with it but have not used peppercorn as firewood.
There is not much of it in tassy. It is a slower grower with a fairly long lifespan, so I imagine it would be good as firewood.
My favorite use for it when I was working in outback nsw was is to get under it in the heat to get away from the damn flies, ha ha.
No........, I dont know why flies dont go under peppercorns.....

Are you planning on bringing a boatload with you?