I would suggest (more of a temporary "patch"), that instead of clicking the report link directly, you open it on a new tab (mouse wheel click, so still one click), so that by the time you finish writing the first report, you simply change tab, paste and I'd bet that does already take 4 seconds
I'm using suchmoon's script. That is, everything is queued to (a personal buffer of) 4.5 seconds between reports. (to avoid the conflict, which still sometimes happens!)
I've already set my report text to fit the majority of the posts that are going to be spam (i.e. Generic, vague, padded, irrelevant) since you're not going to find many of the other options in the forum cesspools that are the * discussion$ threads.