I can honestly say that I've never recieved a message like that. So you're either playing with the wrong people, or you keep running into the same person. I (and probably most other people) use the flags so that I know what language is likely to be spoken in the room.
If a staff or a local moderator clarifies that the suggestion has been bought up before and has been rejected or is highly unethical, the thread will be closed stating so. Note that this might also take place in a situation where most users commenting on the suggestions disagree and is clearly silly.
Flags will stay as flags.
We did discuss customisable icons next to names in queues etc, but iirc it was eventually shot down since it would make it too cluttered