Dear ComGrafPL,
Does it mean Prestashop is not yet mature enough to handle these issues natively? They should have thought this issue from the begining instead of leaving it to module developers.
I tried to remove the IDs by pasting the code you have given me. But, it says the following.
Keyword "{id}" required for route "category_rule" (rule: "{categories:/}{rewrite}")
Keyword "{id}" required for route "product_rule" (rule: "categories:/}{rewrite}.html")
Keyword "{id_product_attribute}" required for route "product_rule" (rule: "categories:/}{rewrite}.html")
Anyways, thanks for willing to help.