This tool won't handle the connection management for you. You could scan for unsecured wifi networks periodically and connect to them. I'm just presuming a thief will log into my laptop's passwordless account, and network-manager will handle the rest.

Well, disabling passwordless accounts is one of the first things I do with my computer.

I wonder if there are scripts that will connect to unsecured networks, whether it's a good idea and how good electronics thieves are at countermeasuring such tools (which is pretty trivial).

I should clarify: the passwordless account is a honeypot. It's isolated from my personal account and everything important. The only point is to encourage the attacker to use the computer instead of reformatting it, so I have a chance of recovering the hardware.