Neat, but not very keyboard-friendly

It's no less friendly than it was without that JS; it's 'progressive enhancement' which builds on the existing textual hyperlinks, which means it ought to render fine (like before) in text browsers (like ELinks, which I use from time to time).

Platypope (link to random article to demonstrate it) embeds them into the sidebar, which kinda works, but again has length constraints.

Mm, not fond of using that much horizontal space. Wouldn't work on LW because we are already using that sidebar for a ton of stuff. Might be able to fit it on the left though.