I'm the developer of another extension and I asked support for integration with sh404sef.
Even if my extension is far less important, they supported me more than I expected.
After installation, sh404sef seems to be a complete and well written software.
I strongly recommend it to everybody interested in SEO.
I found this component while I was for the first time in trouble with "extplorer" which refused to work on a very restrictive server. OSE FileManager instead, has installed and worked without problems. This extension was for me more than useful, and judging the results, it certainly has been coded with care. Sincerely recommended.