This is goodness. A huge step in the right direction. This should also reduce "short meta description" errors as well. Also, with internal cross linking, that should help boost relevancy for similar topics (in a small way).
When is this going to get the next update, and out of "beta"? Seems IP.Nexus is getting updated frequently, but IP.Gallery is left behind. I'm not being critical. It just looks like more effort is being placed on other things.
Yes. You can create a user group that does not have the ability to post links. Then you can configure a rule within that group that automatically "promotes" users to full members after X posts. It's very simple to set up within the ACP.