For the development of an essential and popular tool on Persian Wikipedia, we need a capability to be able to control the address would be brought by browser after the save of a page so we can hook extra needed thing which are only possible after the save of a page, like adding language link of the page to the correspond Wikidata item which is impossible before save of a page.
So I propuse addition of a new hidden input, named "extraQueryRedirect" which its values would be considered for the save of pages and the page user would be redirected to. For example if a user script adds <input type="hidden" name="extraQueryRedirect" value="withJS=MediaWiki:AddToWikidata.js"> to the main form an edit page, the value of this hidden input wouldn't be vanished after the save of the page and the redirect happens. I also have written a patch for this that I hope with some help it goes to be OK to be merged.