I would warmly support the addition of optional user profiles along with the opportunity to register a unique user ID that could be used both to store vocabulary and to identify posts. I'm not sure it would do much to discourage trolls -- only not feeding them does that -- but it might at least encourage regular users not to change nicks quite so often. (I find that mildly tiresome and unhelpful in the more serious forums, because I no longer know as much about whose perspective I can trust based on previous posts.)
But I don't understand why, in the vocabulary trainer dry run, so much personal data seems to be mandatory, not optional. Maybe it's just that I'm unduly sensitive to privacy concerns these days (Ashcroft era + personal reasons). But if LEO were not primarily nonprofit and academic, I would suspect advertisers might be driving the decision-making: wanting data about users in order to target marketing. I hope that's not the case, but I can't quite imagine why else even the LEO staff would need to know so much private information.
Maybe it's just that I'm failing to understand some technical issue, and if so, I apologize. But it seems to me that where security is not a major concern, all you really need* are two fields: user ID ("login" for me is insider jargon) and (self-selected) password. You're not risking letting anyone alter anything crucial like the main database. And even if you were, an e-mail address (which anyone can get at yahoo or hotmail) and a list of data (truthful or otherwise) wouldn't actually help that much anyway. It's cumbersome for people with good intentions, and it won't fully deter those with bad intentions.
So I would appreciate it if, when convenient, someone could say a few more words about some of the thinking behind these decisions, and what any personal data collected might be used for. Thanks in advance, and as always, thank you for all your hard work.