Appears to not work with Apache 2.4.7

I'm attempting to get this module working running Apache 2.4.7. After much testing, I cannot get the incoming requests to redirect to js.php. Once the module is enabled, the .htaccess file lines added, and the js.php file moved into place, the only immediate effect I see is that calls to /js/foo/bar are still routed through index.php. The page callback is still executed, but a 404 is returned.

I'm attaching a mod rewrite log output, and will post back here if I come across a fix.

This is the code, placed immediately in front of core's index.php rewrite rule (although I've tried it virtually everywhere).

  # Rewrite JavaScript callback URLs of the form js.php?q=x.
  RewriteCond %{REQUEST_URI} ^\/([a-z]{2}\/)?js\/.*
  RewriteRule ^(.*)$ js.php?q=$1 [L,QSA]
  RewriteCond %{QUERY_STRING} (^|&)q=((\/)?[a-z]{2})?(\/)?js\/.*
  RewriteRule .* js.php [L]