You should add the control panel one as well, it's a 2 second delay listed in the libs
You might not want to add it to the control panel. I can see problems occurring when an admin user runs one of the "Content Rebuilder" options (Rebuild Posts, Rebuild Topics, Rebuild Forums...etc) This may kill your server/database -- or at the very least, to the admin running the command, make it look like the page isn't loading at all.
In the same sentence, there is a "refresh delay" of 5 seconds at about line 1393 of html.inc.php regarding incorrect/bad password entry ("BAD_PASS") that should be left as-is, or extended to 10 seconds if you so choose.