It can be done yes, but it would not have a good effect. The reason being is that authorship was meant for articles and good content, not for just general content like thousands of product descriptions. Also, this is not the correct use of authorship, this is something that you would use publisher for instead.
If you ever had decided to blog or post articles any where else, you would be hurt as well. From the best that everyone understands right now Google ranks authors by the content and the sites they write on. Having loads of low quality content like the product pages will drive your authorship ranking in the ground and hurt the ranking of your blog posts I would bet.
As for the rich snippets, you can have product snippets without the review. I also would like to point out since open cart is template based all you have to do is add the snippets to the template page and it will work on all of the products.