I don't think this forum gets much attention from the developers looking at the other topics.
As I couldn't find a way to switch it on and off I inserted the code into the template
<a class="home" href="/">Home</a>
<a class="back" href="javascript:history.go(-1)">Back</a>
Remember to remove the code that is supposed to do the job because you never know, it might work in some circumtances and you'll get two sets of buttons, so remove this
<?php if(!$MobileJoomla->isHome()): ?>
<a class="back" href="javascript:history.go(-1)"><?php echo JText::_('TPL_MOBILE_IPHONE__BACK'); ?></a>
<a class="home" href="/<?php echo $home; ?>"><?php echo JText::_('TPL_MOBILE_IPHONE__HOME'); ?></a>
<?php endif;?>