Thread:Project:Support desk/Interwiki Links on side bar/reply (6)

That option is simply there to provide you with a way of not bumping the thread after adding or editing a post. Rest assured that I noticed every time you posted, as others likely did as well.

Wiktionary does this with templates and JavaScript. See Template:Wikipedia, the "InterProject" section of MediaWiki:Common.css, and the "Interproject links" section of MediaWiki:Common.js.