A few years back, the "No action needed" option was added to the First Post review process to prevent an overabundance of voting.
The pendulum has swung too far the other way, now, and people are just clicking 'no action needed' without actually fulfilling the purpose of the First Post review queue (to ensure that first posters get abuse-filtered, or alternatively some friendly guidance, or votes...).
I suggest that the right compromise option to this is to allow people to press "no action needed" still, but to remove the 'reward' of the stats-count for those actions, similar to the 'skip' button. You actually have to review a post in order for it to be counted toward your review stats.
Thus, the difference between the skip and no-action-needed buttons will be:
- skip - do nothing, and leave the post in the queue
- no-action - do nothing, and remove the post from the queue
Thus, you do not earn review badges by pressing 'no-action-needed'.