I am a big fun of this plugin. I love the hooks you have added here and there as they have given me much room for manipulation and extension.
I am having a problem when I am trying to change the 0.00 - Purchase to Free Download and I have add a custom filter like this in my code
<?php $args = apply_filters('edd_args_passed', $args); ?>
and I can make look how I want it to look.
Can you please tell us why you did not include that in the first place. Will it cause any problems?