[bigmattyh]

add the little magnifying glass next to users name

This isn't a hack; it's a template modification. Make a little magnifying glass, put it next to the name, and link it with the search URL for that user.

only show the edit post button on posts made by that user and if its within the allowed edit time

A simple search provides the answer. Here's how.

show the post number on the corner of the posts

Again! The mysterious "search" button works wonders: here.

thanks

I don't want to sound rude, but do a little legwork on your own. These answers were very easy to find.