So I've got two Wifi networks broadcasting on the one SSID, and unfortunately the Chromecast often connects to the wrong one with less signal strength. If you've rooted your Chromecast, you can change the wpa_supplicant settings directly to get it...
Posting it here in case someone is trying to achieve the same/similar things with their own Chromecast.
HOW TO: Add (any?) Chrome command-line argument to the Chromecast shell / Get the remote DevToo...
Got the file, only to find out that I need to restore a whole bunch of other files. I give up for now, but if you have the 3G Nexus 7 (2012), it's attached.