Personally, I wouldn't mind it if you cloned an existing fireplace -- I'm pretty flexible when it comes to what fireplace I use for my houses. Also, if you did that, wouldn't you be able to simply replace the GMDC of the cloned fireplace with the GMDC of the other fireplaces to make multiple fireplaces with this hacked option? It's not ideal, but I think it would be less of a pain in the arse to do than extracting the pie menus from all the fireplaces. I wouldn't mind cloning your hacked fireplace and replacing the GMDCs with the GMDCs of the other Maxis fireplaces myself if that's all it needs.
