Say, I have a simple suggestion I'd love to see integrated into the plugin...
If it wouldn't be too much trouble, could you add a wrapper element (a span, div or even just an i) around the comma that is added before the timestamp? I understand the added "readability" with the comma, but for some site designs, the comma really sticks out too much. With a simple wrapper element, users can hide the comma in designs that don't need to show it.
Thanks again for a great plugin!