The only one of the suggestions I think is truly worth thinking about is to hide the SSID. As long as remote access isn't enabled, they would need to first get on the WiFi (or ethernet) to make router changes. Would it be annoying if they messed with your settings: yes but it can easily be reset and from a security/ illegal downloading standpoint you are already screwed. That said, if you don't mind the hassle of the new security restrictions, you might as well.
Hiding the SSID doesn't do a ton and can be really annoying, but if you have only a few devices it doesn't hurt. It doesn't provide much in terms of actually security but it does imply that you are security conscious. If I was trying to guess/brute force a WiFi password, I wouldn't start with a hidden one. (unless you get a geek that takes it as a challenge and wants to teach you a lesson on how hiding the SSID alone doesn't make you secure)