Denon AVR regional differences

Hey all, I have an x3400h running a 5.1.2 setup. It works well but I checked out the new x3900h and x2900h to see what my options were if I ever decided to upgrade.

The main thing I want to have is a 12v trigger output to turn on/off my sub. The x3900h has one but it may be a little overkill for what I need plus it's like $1000 more than what I paid for my x3400h.

The x2900h would be more suited but when comparing specs, etc I noticed the US version has a trigger but the UK/AUS version doesn't for some reason... Anyone know why they would do something like this?

btw, I'm from Australia.