Ok, so your players meet a mysterious figure in game 1, who you make a page for called "Mysterious Guy". Come game 5 your players discover, "Wait! Mysterious Guy is really Uncle Brown!" Now you are stuck with a page called Mysterious Guy. I guess one could always just rename it with the [[ example | example ]] but a redirect would be nice :)
Here is another example: "http://en.wikipedia.org/w/index.php?title=Wikipedia:User&redirect=no":http://en.wikipedia.org/w/index.php?title=Wikipedia:User&redirect=no
It's a neat idea, I'll give you that. However, it's sort of an advanced feature that will probably not be nearly as useful as it is on Wikipedia (Mediawiki). For Wikipedia, you have all sorts of ambiguity that has to be addressed, whereas with most OP wikis, they're fairly small and straightforward.
So, long story short, setting up redirects for wiki links is definitely near the bottom of the feature list. It's not that it's a bad idea, it's just that with our limited time to work, we've got a lot more pressing issues to deal with.
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Here is another example: "http://en.wikipedia.org/w/index.php?title=Wikipedia:User&redirect=no":http://en.wikipedia.org/w/index.php?title=Wikipedia:User&redirect=no
So, long story short, setting up redirects for wiki links is definitely near the bottom of the feature list. It's not that it's a bad idea, it's just that with our limited time to work, we've got a lot more pressing issues to deal with.