Don't make the reviewer enter more information, and don't make this data prominent... but it's easy to record user-agent info, like browser and platform, etc.
Adding the Browser, OS, resolution and other environmental features used by the reviewer would be a good idea. For ex. If something shows up corrupted on a reviewers browser, it would be good for the website owner to understand which browser displayed it as as such.
If this is done automatically by Feedback roulette, it would be easier for the reviewer too.