Instead of a flat rate of no more than 1 comment flag every 3 seconds, change it to something like no more than 5 comment flags every 15 seconds. The overall rate is the same, but by allowing for bursts, it speeds up the workflow of flagging multiple comments that comprised an ill-placed chat session.
Refinement: (based on feedback so far)
These are some use cases for flagging multiple comments:
- Related chatty comments (as I alluded to above).
- Unrelated comments that happen to be on the same question.
- Related comments that have become obsolete together.
In all cases, there are at least two inefficient workflows:
- Flag comments slowly, due to a rate limit that doesn't allow bursts.
- Flag the question and type out a description of which comments are problematic. This option is inefficient because you lose the computer-aided mechanism for specifying the comments in question, besides the manual nature of the process in general.
There is an efficient alternative:
- Flag comments quickly in a burst. Then have the moderation engine flag comments on the same question or answer and present them to the moderator as a batch. This would require two changes: Support bursty flagging (the original proposal of this question) and support batching flags for moderation.