i was exited to finally have found a plugin with these abilities.
But actually, its not working.
Just, tried it on a fresh install of wp 3.3.2.
Uninstall of akismet plugin was the only tweak.
So "htaccess secure files" remains the only plugin.
Secured one uploaded file. If done, it is completely protected. Even for admin, although default roles are set.
I can read php, but am unable to give any help to find the error, sorry.
Despite that the redirection is broken as well.
I really would like to see a fix here ;)