Aswell as those settings - you will need a correct .htaccess file present and active to do the redirection (well page naming if you like)
Regarding the content of the titles, keywords and descriptions etc - you may have to actually EXECUTE a module which "Fills Tags" for you. As this is generally not done on page requests on the fly.
In oscommerce theres an option under admin called "Header Tags SEO" - then under that theres an option "Fill Tags" - this fills fields on the database - which are then passed to the php routines on the fly - so you can see theres an extra step involved in loading up the DB so that the "products.php" script can pick up the text and put it in the metas.
Hope this helps somewhat.