@teddy: so you're having trouble viewing a product page after changing your viewing language? hmmm
could you provide me with an example url so that I can test?
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regarding the DSEFU mod, it would be best to change the [L] to [R=301] for any rules that overlap with XC SEO's rewrite rules. that way, search engines will be redirected to the .php url, and then be redirected again by seo.php, to the new html structure (to avoid duplicate content).
I'll have to look at the Safetynet rules tomorrow to provide you with rule changes that should work.
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regarding home.php and other pages not currently supported, I'll see what I can do