Is there a way to get a complete list of redlinks from a wiki? Or, if a complete list is unfeasable, is there any way to get a list bigger than the 1k links on "Special:WantedPages"?
There appears to be no built-in way to get more than the first 1k. However, if you know JS, you could write a script to crawl through each page on the wiki, compile a list of links, and then check each of those links. Though that could take quite a while to run. Why do you need more than the first 1k? 1k is already a lot of pages.
I don't know about Soranin, but, back in pre-UCP times, I asked the same question on behalf of a user whose editing style was focused on swiftly dealing with isolated red links.
In my experience, no one who wants more red links needs to know them. They should just spend some time getting rid of them. If your list is over 1K, you have bigger problems than not being able to see enough red links.