Yes, I agree, that would have solved my problem too. There’s only like twenty template tags available and I’d like to be able to just insert PHP to achieve something like %post_thumbnail_url%. But I can’t do so, because it only supports HTML.
I don’t know what you trying to achieve, but it’s easy to implement processing of PHP from templates. That is just security hole, but never mind 🙂
Open file blog-in-blog.php, find line return $template; (line 539) and insert above that line code:
ob_start();
eval("?>$template<?php ");
$template = ob_get_contents();
ob_end_clean();
Cheers