'rpath' sounds pretty general to me (if not particularly self-documenting). Is there really a significant bang for the buck to changing it? (Or, different way of asking same question: If that comment weren't there, would we care?)
Put simply: I don't think so. I'm in the process of (slowly, and eventually) converting all the todo items in the perl source across to RT tickets. This has the dual purpose of us checking corners of the code which might be a bit dusty and cleaning the code up a bit. If we don't need the comment, we can just delete it and resolve the ticket. Thanks for helping out by looking into the comment! :-) Paul