Hello, i just made a trick in vm & joomla so every "press here to login and to review this product" url direct to a vm login module with parameter such like product_id in url so after login or registration user i redirected back to product page to write review. My issue is that this will generate as many registration pages as my products are. Can i somehow avoid this? or tell Joomsef to do not count these parameter?
Thx in advance

Hi,
You can set these variables as Custom non-SEF Variables in User extension parameters on the Common tab, so they will be appended as non-SEF.

So the default url that i use to show user the login screen is

which i have renamed in Artiosef to "account".
When a user press on the review button, the parameters make the url looks like :

So probably the parameters are :
"category_id, product_id" right?
if i add previous line as you suggest in Custom non-SEF variables, then new urls wont get created for each product href? Will this get sef? eg account?parameter

Exactly. If you set "Custom non-SEF variables" field of User extension to "category_id;product_id" (without the quotes), the URLs will be created as:
account?category_id=120&product_id=150
and there won't be any new SEF URLs generated, because the category_id and product_id won't be stored in database.

That means also that non of the new urls will be index or mentioned as duplicated from google right?

If the URLs are publicly visible on your website, they can also be indexed by google. And there may also be a problem with duplicated content, because I suppose that the login screen that is displayed is the same whatever category_id and product_id is in URL.
But you can use Google Webmasters Tools to tell Google that those parameters don't change the page content, in Configuration -> URL Parameters. This should exclude those URLs from search in Google. However, maybe you should consider renaming those parameters (eg. to cid and pid) so you don't lose some other pages that may use the category_id and product_id. But that depends on what URLs are used on your website.