Come on! Let's cull this talk. In the era of globalisation,this is to be expected. Else, we will have a lot more debates about the Roys, Pietersens, Strauss', Panesars, Morgans, etc.
For the record, I believe Usman is an Aussie citizen, but might hold the Pakistan Overseas Residency.
Eh I have no issues with it at all. I'd rather people be addressed by the country they prefer to live in or identify with more in all honesty. The bit about Khawaja was because I remember it coming up during his visa delay for the test series in India this year.