Comment gadget

That's because it relies on the newNode function in Mediawiki:Common.js.

Copying that function seems a reasonable burden. :) It would be nice if you could format the script as a gadget and add a couple lines of instructions to install it on any other wiki: I'd then copy them on some mw: page and link from the pages of other (abandoned) systems.

What does it mean exactly to "format [a] script as a gadget"?