In the old comment flagging UI (the one before major changes were made to the comment flagging system recently), it used to be that if another comment was flagged within the last five seconds, the submit button would be disabled, and only re-enable itself once the rate limit expired.
However, with the new flagging UI, this feature appears to have been removed: the button is always enabled, and clicking it before the rate limit expires produces an error message.
Can this feature please be added back? I liked that feature because I often flag multiple comments at a time, and the current error message covers up the button, meaning it has to be closed before I can re-click it.