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I found a way to default the domain:

Browse to:

C:\Program Files\Microsoft\Exchange Server\V15\FrontEnd\HttpProxy\owa\auth\<latestversion>\scripts\premium\

Make a backup copy of fexppw.js, then look for this section:
// UPN authentication isn't supported, don't fill in the username
// if it's an email address
//
if (rg && rg[3].indexOf('@') == -1)
{
// Fill in username, set focus to password
//
gbid("username").value = rg[3];
gbid("oldPwd").focus();
}

Change the username value setting code to this:

gbid("username").value = "YOURDOMAIN\" + rg[3];