I realy dont know what you exactly want
Some people originally thought "instance switching" was being able to switch the portals that let you into instances so that lets say the rfc actually sends you to molten core. That is incorrect, what instance switching really is making the inside of an instance into something else.Just go to the Terrain.wmo and start looking through and switching instances. SchoolofNecromany is Scholomance. And CavernsOfTime is Old Hillsbrad.I no longer own a copy of WoW so I can't make the speech2.mpq files for you guys so if someone would like to do that and upload it for noobs to use go ahead.1. Get a BatchRenamer. Should be easy enough to find2. Get MyWarcraftStudio3. Open Terrain.wmo4. Work from there.Basically all you are doing is taking the files from Old Hillsbrad and Renaming them ZulFurak so that when you go into ZF you actually get Old Hillsbrad.Keep in my some instances will not work together.Emerald Dream and SchoolofNecromancy(Scholomance) fits perfectly.Old Hillsbrad Foothills and Zul'Farrak(I advise you to go FAR into Zul'Farrak before changing otherwise you'll just meet some stupid invisible wall) fits together.