Ashley, osCommerve v4 comes heavily SEOed, at least in terms of on-site SEO.
It is possible to set default template for URLs, titles, descriptions, image ALTs, and some other parameters for products, categories, landing pages, and some of the system pages too.
Then, it is possible to override the said properties for any particular entity, if required.
It is also possible to add SEO redirects from old URLs to new, thus helping customers who found an old indexed URL in Google or elsewhere to the new product page.