I am from Abingdon Maryland
I am not saying your idea is not good I am merely stating how the program operates since you asked about a feature. Not all servers support htaccess which our product has to support all servers.
I do not own
VBSEO so I am not totally sure how they perform there addon functions to vbulletin. I am sure its a mixture of htaccess and code. I was merely pointing out how a default vbulletin code operates. The way our program operates is much the same as the default vbulletin each script has its own set of variables.
Basically that script needs the item variable passed and thats how we get the product id.
This is not to say in the future we may not have this type of feature just that it does not exist now.