There is no built in option for this at the moment.
You could however, if you have the ability, overwrite the post-template from your theme.
To do this, create this file in your theme: /elb/post.php.
File could look something like this:
<?php
do_action( 'elb_before_liveblog_post', $post );
?>
<p class="elb-liveblog-post-time"><time datetime="<?php echo get_the_time( 'Y-m-d H:i' ); ?>"><?php echo get_the_time( 'Y-m-d H:i' ); // your custom timestamp ?></time></p>
<?php if ( elb_display_author_name() ) { ?>
<p class="elb-liveblog-post-author"><?php printf( __( 'By %s', ELB_TEXT_DOMAIN ), get_the_author() ); ?></p>
<?php } ?>
<h2 class="elb-liveblog-post-heading"><?php elb_entry_title(); ?></h2>
<div class="elb-liveblog-post-content"><?php elb_entry_content(); ?></div>
<?php echo elb_get_template_part( 'sharing' ); ?>
<?php if ( current_user_can( 'edit_post', $post ) ) { ?>
<div class="elb-liveblog-actions">
<?php edit_post_link(); ?>
</div>
<?php } ?>
<?php do_action( 'elb_after_liveblog_post', $post ); ?>
