In order for me to use Google Now's hotword ("OK Google...") I have to set my language to English (US). This is fine, but I hate having to correct language differences (e.g. "Call Mum" vs. "Call Mom", "Colour" vs. "Color" when searching Google Drive etc.) and wonder, what prevents Google Now from displaying the hotword tick box in the settings? Is it a flag or phrase in the offline language file? Is it hard-coded into the APK? And more importantly, is it possible to enable the hotword option while retaining a non-English (US) language setting?
I'm waiting for my Nexus 5 to arrive (hopefully the day after tomorrow, as tomorrow is a public holiday), and one of the purchasing decisions for me was the Moto X-esque hotword detection from the homescreen (and hopefully, always-on hotword detection?), so it'd be good to use my language of choice, while keeping an advertised feature.