Default "Site Name" block

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When creating themes, I'd like to have the option to put the Site Name as a default block (like it is in the default c5 themes - so that's taken care of) and also be able to edit that block to insert something different (such as a logo). The current way I'm doing this is the same as the salad theme:

<a href="<?php    echo DIR_REL?>/"><?php   
            $block = Block::getByName('My_Site_Name');
            if($block && $block->bID) $block->display();
            else echo SITE;?></a>


How can this be modified to allow that block to be customized?

overthemike