[Dean C]

Originally Posted by Masiello

This would damage who uses already the actual version of DC SEO since after the updating this modification change all the url inside the users posts making them void.

Indeed, whilst I can see some justification in building an engine to manage the rewriting of URLs, and it wouldn't actually be that hard, the actual ability to give the users the ability to change their URL structure is risky. Changing URLs all the time will have severe negative effects on ranking. Also the only way to really handle the rewrite engine is to pass all HTTP_REQUEST's to a gateway script. That is not very efficient internally, and this is exactly what vBseo does.