I've never tried the boiling trick. I think I"m going to prepare my goose the same way I cooked my duck (not the poor blackened one that met with the inferno). Per Raichlen's duck instructions---I pricked it all over (only skin deep with a fork) and set it in the fridge uncovered overnight. Then before the cook, I pricked it all over again and cut slits near the leg joints (of course, it was a beer can duck, so that was to help the fat drain out the bottom). Anyway, the goose is gonna' get the same treatment, even tho it's going on the rotiss.
I can't recall the flash point for duck fat, but my first cook went wrong when I added red hot coals after the first hour. For the next cook I used the minion method, so that solved the problem.
I took that thing to over 160 (my mom is paranoid about undercooked poultry) and it was great. Looking forward to the goose!