I've done some more research. I find that now the police can cause the reason by which they enter your home without a warrant. In Philly at least, the police can search you on the street without a reason. I am therefore amending my 4th amendment list.
Places to avoid if you wish to retain 4th amendment protections:
That guy was BSing you. It is actually nearly impossible to steal wi-fi this way. Otherwise, we wouldn't be able to use IP addresses to uniquely identify people. It's much easier to just keep the default router settings.
Send me your home address and I'll drop by and explain further.