For example here: http://stackoverflow.com/questions/8143045/commenting-on-a-thread?noredirect=1 (10K only). If you would try to vote on a comment you would get this dialog:
If you try to flag it you get this dialog:
Did the system not just tell me that was not possible?
So I tried it. I typed in some random info into the other tab.
Flag Comment and lo and behold -- I get the same dialog as if I had voted.
Shouldn't just the first dialog come up in this instance?
Why give people false hope into thinking they can flag by letting them put in all the information and then showing the dialog?