Well i think there should be an other catororie you can pick from. Because when i was going to report someone they didnt' have what i wanted to report them for and that was not quoting stuff. Also there is some stuff that doen'st fit in other catogories.
I think an "Other" category might be in order there.
I notice that it's possible, however, to report one particular post for copy-pasting without tags. Maybe while writing the report description, you could mention that this user has also written other posts without using quote tags, and we'll then look into his other posts.
Not everything fits in the provided types. In that case, you simply don't select any types and write it in the description.