More and more frequently in the review queues, I am spending time either fixing a post or considering whether an edit is valid, etc, only to make changes and have them denied/not count because someone else has blindly hit the approve button in the meantime.
My proposal is for the system to "lock" a post in the review queue once it has been presented to someone for review. Do not let anyone else (in the review queue) do anything with it until it is released by the last user it was presented to (or a certain amount of time has elapsed).
By "lock" I mean that it won't show up in anyone elses list until released. I did NOT mean that it would be in multiple queues and be unactionable in some of them. This would fit well as the queues only present one at a time anyway.
This will allow people trying to make good decisions the time to do it and prevent someone else from making that effort a waste of time.
As support, look to some of the published reasoning behind the auto-question ban. A large portion of it is that bad questions waste the time of the community. Taking the time to ensure you are making a good decision in the
/review queue only to have it not count because someone was badge-whoring and clicking the approve button as fast as they could also wastes the users time... arguably the more (for lack of a better way to put it) valuable user who is willing to invest some time and thought into making the site better.