Excellent idea but the devil is in the details. Without using antique fonts I'm still not sure I'd know which is which. I think many people could not sequence monospaced fonts invented after the typewriter. At least not those that I would endorse for use here.

You place the onus on the seeker to know which Perl version he uses and to know the PM arcana show that to his readers. I'd rather see something like the required selection box modify the behavior of a <code> tag. And additionally have specific code or perl tags for the more expert user.

I did not make it clear earlier: I'd expect that one result of the selection list would be an information box near the title of the node, and perhaps its replies.

(I'm responding to your earlier post since your current one has clarified it for me.)