Would be nice to be able to restrict uploads to reviews where the uploader is an author. Twice a situation has occurred where someone uploaded files to the wrong review, significantly impairing the ...
You could configure the default review access permissions such that only participants could only access (and thus upload files to) reviews that they are a participant in, and you could go further to only allow authors / creators to upload files. It won't prevent an author from uploading the file to a wrong review if they are also the author of the wrong review, but I don't think there would be any way for Collaborator to distinguish that.
It would be good to delete a change set from a review with comments logged, as long as there are no comments logged against that change set - that possibly may already be implemented, I don't recall. If not already implemented, I believe there are enhancement requests in this forum on that topic.