Connections does have some of these features…
1. No, interesting idea. I’ll add it to my feature request list.
2. I would suggest the Link Extension.
3. Yes when Link is installed.
4. Not certain I fully under stand the question. There is a CSV Import extension. Does that helps?
a. Sorry, no featured entries.
b. The Default template does have a “Last Updated” timestamp of sorts. It shows how many days ago the entry was last updated.
1. Link, allows you to moderate the submissions.
2. Sorry, no, not yet.
1. The entries are marked up using the hCard spec which is a search engine friendly microdata. The URL/s created for the entries permalinks are also SEO friendly.
I hope that helps. Also, I would like to apologize for my delay in my reply as I was not receiving my notices for new support forum posts for about a week. Just reply notices to ones that were already started which is why I’m just now noticing.