Installing this plugin (which I had great hope for, I really want this feature and may just have to build the behavior directly into my theme now!) caused the custom fields block to disappear from the edit pages.
Rather funny moment when an editor who was using the site made an error in HIS procedure and I activated this a moment before joining his desktop to walk through his procedure. What he had missed was part of a custom field set, and while he had just forgotten, I couldn't show him because it wasn't there! I sent him to grab a cup of coffee, and I quickly deactivated your plugin and the fields returned. With a sigh of relief I pointed out what he had missed and moved on.
So the long and short of it is, don't use it with 3.7. The instructions said it wouldn't look pretty, and they sure were right!