Is the ability to join corps and kills going to the KB in this area necessary? This is supposed to be school for the new player, they could be recruited in game when they get there ... there should be every incentive to stay in this area to LEARN what the game is about and how the mechanics work ... no rushing the new player here.
But once they learn what a great game it is and how to play it, there should be NO incentive to stay there, the new player should be eager to get to the real game world. And start playing. I can see the appeal of veterans to form a trial and try out the various simulations. But vets using trials to stay in this area for free pvp with noobs completely defeats the purpose.
So I would suggest no to allowing new players in this area join existing corps, and no to allowing any of the pvp kills in training be posted on the killboards.