Minishop2 and Office: additional fields (gender, building, fullname)

Dear MODX Community,

I some questions about using fields in minishop2 with the Extra «Office».

1. user field «gender»
I added a select field for the gender of a customer. I want to use it for the salutation (Mr. / Ms.).
It works within the Office form chunk (tpl.Office.Profile.form)

<!-- gender: {$gender} -->
    <div class="form-group">
        <label class="col-md-2 control-label" for="gender">Anrede</label>
        <div class="col-md-2">
            <select class="form-control" name="gender" id="gender">
              <option value="0">-- Anrede --</option>
              <option value="2" {if $gender == "2" }selected{/if}>Frau</option>
              <option value="1"{if $gender == "1" }selected{/if}>Herr</option>
            </select>
        </div>
    </div>
    <!-- end gender -->

But on registration (in the chunk «tpl.Office.auth.login» it does not save the gender. How do I activate it?

2. Gender in a order of minishop2
How can I add the field «gender» (see above) in the address fields in a order? Chunk «tpl.msOrder».

3. Email addresses with errors
Sometimes new customers do write their email address with errors. Is there a way to add a second field for the email address where they have to enter the email address again to verify it?

thank you for your help.
Fabian

[[!msOrder?
    &userFields=`{"gender":"gender"}`
    &...
]]