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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];
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