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For me, forcing 1080i output would have been fantastic. My TV advertises 1080p support but for complicated reasons, does not support it.

Forcing screen resolution / changing aspect ratio is what I'd want. I've got my Chromecast connected to an ancient 4:3 TV and I'd love the Chromecast to support that, or to at least not pillarbox 4:3 Youtube content. Unfortunately there's no setting on my TV to change the aspect ratio, I have to do it on my devices.

(Yes, I know, I should just upgrade the TV, but in that case I probably wouldn't have bought the Chromecast.)

One thing which comes to mind is the DNS settings on the Chromecast can't be modified so being able to change them could help get around regional restrictions.

It could also be fixed at the router by forcibly redirecting the DNS traffic to another DNS server.

Like in `iptables -t nat -I PREROUTING -p udp -s 192.168.1.100 --dport 53 -j DNAT --to 192.168.1.2`

My understanding is that if you prevent Chromecast form reaching Google's DNS servers it will allow you to provide an alternate address. Haven't had a need to try that myself, though.

When I try to stream from the US Netflix, chromecast blocks it. (Canada)

This restriction could be unlocked one day.