I would add to your list: better tag support. Tags are very confusing for a new user. You've got a list of tags on the left that are the most common, but if it's not on that list, it's like it doesn't exist. Some type of auto complete of tags or other way to suggest "Hey, other users used a tag that was mostly like yours and it is X" would be very handy. I was struggling to find the right tags for posts.
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there is a link at the bottom of the tag list for the complete list of tags.
You are right though. Perhaps just a way you could search tags might work. It is really confusing and hard to find a tag you may want.