[TYPO3] weird radio button rendering in mailform (4.0rc2, csc)

[Axel Jindra]

I have a mailform with radio buttons which gets rendered strangely cause 
of a double fieldset around the radio buttons:

<div class="csc-mailform-field">Anrede
   <fieldset class="csc-mailform-radio" id="testform_radio">
   <fieldset id="mailformAnrede">
   <legend>Anrede</legend>
   <input type="radio" name="Anrede" id="mailformAnredeHerr" 
value="Herr" class="csc-mailform-radio" />
   <label for="mailformAnredeHerr">Herr</label>
   <br />
   <input type="radio" name="Anrede" id="mailformAnredeFrau" 
value="Frau" class="csc-mailform-radio" />
   <label for="mailformAnredeFrau">Frau</label>
   <br />
   </fieldset>
   </fieldset>
</div>

I've had a look at CSC and it says:

1248: tt_content.mailform.20 {
1254:   layout = <div class="csc-mailform-field">###LABEL### 
###FIELD###</div>
1256:   RADIO.layout = <div class="csc-mailform-field">###LABEL### 
<fieldset class="csc-mailform-radio" 
id="testform_radio">###FIELD###</fieldset></div>
1257:   LABEL.layout = <div class="csc-mailform-field">###LABEL### <span 
class="csc-mailform-label">###FIELD###</span></div>
1258:   labelWrap.wrap = |
1260:   radioWrap.wrap = |
1262:   stdWrap.wrap = <fieldset class="csc-mailform"> | </fieldset>
1263:   params.radio = class="csc-mailform-radio"
1266: }

So I see the outer fieldset is rendered statically and the inner one 
dynamically. Problems will arise if there is more than one radio button 
fieldset because the id attribute is not unique anymore. On the other 
hand the fieldset with the dynamically created id attribute lacks the 
class attribute.

Somewhat confused what to do...

Axel.