I like the first solution, but due to the inconvenience in having to figure out node numbers, maybe you could introduce some linking 'macros'. For example, if I want to link to the last node i was at, [last-node] would do it. If i'm typing at the chatterbox, [this-node] might be useful. In threaded discussions, [parent-node], [prev-sibling], [next-sibling], might be moderately useful...

Would this be practical? I'm not sure how the architecture of perlmonks would make this easy/hard. Personally I think the [last-node] has the most potential, simply view the page you want to comment on, then go to the discussion and paste it in.

-Mark