Hoi,
Absolutely. There is no reason why en-AU or en-US are not valid and cannot be used in WIkidata for monolingual text.. That is a particular property in Wikidata. What is a problem is that at the same time codes are given a meaning that does not follow our language policy.  The policy exists to prevent the abomination of using codes for something different.
Thanks,
        GerardM

On 12 November 2017 at 18:09, Michael Everson <everson@evertype.com> wrote:
For what purpose? What context? You have given no information about the requester or the request.

en-AU, en-CA, en-GB, en-IE, en-NZ, en-US, and en-ZA are the usual ways of doing these things.

> On 12 Nov 2017, at 09:08, Gerard Meijssen <gerard.meijssen@gmail.com> wrote:
>
> Hoi,
> There is a request for a code for Australian and USAmerican English. For use in Wikidata there is imho no reason why not to allow it.
> Thanks,
>        GerardM
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