Yes and no.
Yes, you can track additional fields in your own table(s), but there is currently no way to connect that data back to a particular comment (commentID would be the shared unique ID).
However, with version 10.3 cforms will track any additional comment form fields with an ID/Name of customX, e.g. My Custom Field 1[id:custom1] in the cforms table, together with the comment ID.
There will be a new API call, e.g. cf_extra_comment_data(id)which will return [in an array] all extra fields per provided ID (which you have access to inside the comment LOOP).
This will make it extremely easy to add any number of new comment form fields and reference them later on.