Agree with you. It will be implemented in the next version of pun_quote.
Just as an example, (I never thought to mention it previously), there is a live example on my testbed forum.
If you log in with the following credentials:
you can see in the CSS, topic view source and js source how I've done it.
p.s: There is also an alternative multi-quote system in progress on there which may be another line to think on with regards to the pun_quote setup. It uses the traditional quote system, but can span multiple pages in a topic and doesn't require the post info loading in the normal output HTML. Just thought it may be worthwhile having a peek at, if you're curious.