I often go through my previous questions on SO/SE and find a lot of them have long resolved discussions. Ideally, I should raise a post flag and say "all comments below are obsolete; please delete". However, quite often there are 20 comments, out of which - say - only comments 1, 2, 3, 5, 8, and 13 are obsolete. In such a case, I've to manually flag each of them as no longer needed.
This userscript helps to flag comments in bulk. Screenshot:
Do whatever you wish to do, just don't sell this for money (but may use it in a commercial software's code) or state that you made it yourself. Do post here an answer if you do something cool with this :D
Post bugs or feature requests as answers below!