There is the personal verification process you can do to verify you on the forum.
This is the thread to alert the mods that your PRIVATE album containing verifying photos is up. Post a PRIVATE (so only the admins and mods can see it) album that contains at least two pictures of you holding a handwritten (not printed) sign that includes: 1. Your exact Kink Talk username 2...
www.kinktalk.com
That's this one. But not verified doesn't mean they are not sincere and verified account doesn't mean they are completely safe.
I think a set of entrance question is good, but it also rises the question of how hard you want it to be?
There have been naive girl here where I tried to answer questions and hopefully point her in the right direction, when I first join I am no better then them besides knowing consent is the most important thing. There is no away the past me can pass a hard set of questions. I still don't know the correct technique for chocking play and I was never into it until now. So if that is in the question I am certainly going to fail. It is not good to set the bar too high and turn away potential new people , not give them good advice. Kinky is fun but also dangerous. It's better for them to get good advice then turn them away and have them learn whatever they can find.
On the other hand, an experienced predator who is determined to exploit innocent others will be experienced enough and hide himself behind the set of hard questions. Now you give him an extra layer of false verification that he "passed the test so he must know his things". This is also very dangerous. Because this badge of "pass the test" it would be harder to discredit him when he brings up bad ideas and dangerous tasks. It's already hard at this point when arguing with others on forum regarding sub safety here.
And there is also what kinks are you going to cover and what you want to focus at? Are you going to identify who is the "real dom" by specific questions related to specific kinks? I mentioned before I am not into chocking so I know nothing about it. Same with femdom and anything male submissive related. If Those are the only questions I get, does it really reflect on how good a dom I have?