Having had access to the pending edit queue for a full two days now, it appears that very few proposed edits are rejected due to content being plagiarized from another source without attribution. Most are rejected due to the editor attempting to add what should be a comment, or because their change was too significant.
With that in mind, could the default selection be changed from "copied content" to "invalid edit"? This is a minor thing, but selecting those minuscule boxes is a pain in the buttocks. I supposed a larger feature request could be to enable the radio buttons to be chosen via keyboard (1-5 or something), but that can be a separate feature request.
Just in case it's needed, this is currently the default: