You see, you openly admit that this feature would actively inconvenience others because you don't want to participate in particular content. It sounds harsh, but that's extremely selfish. Saying that we should have a feature that ultimately curtails its own usefulness by allowing players to cherrypick is a bad gimmick. The roulette specifically offers a bonus for this. If you want to queue for particular dungeons, you have the capability to do so with Duty Finder, but the roulette rewards are very specific to the concept that you are playing whatever content needs to be filled.

So I'm sorry, but your idea while seemingly functional for you is not a good one for the community as a whole.