Why do you want to exclude redirects from Special:AllPages?
Partly because most of the user are getting confused if they see the old title also listed. They are not sure which one is now the official title without clicking on the article link and then finding out looking at redirects. Also for lot of them it is a personal preference.
Other users on your wiki might like having the redirects on
Special:AllPages. I have no issues that mediawiki maintains internal redirects. For example, if somebody types in the old article link http://myserver/wiki/index.php/Project_Blue it should still redirect to the new title. All I want is that it should not be displayed when somebody clicks on Special:AllPages. So basically do NOT display but still maintain the redirection -- a cosmetic change.