4) Comment/Uncomment selected range.
This can already be done using /* to start the range of lines that are to be treated as comments, and */ to end the range
1) Line numbers on the left.
Personally if this was to be implemented, I would hope that there would be a way to disable it for those that don't want it.
6) Find/Replace with Wildcard and Regex support.
While I can't speak for the regex, it seems to me that the Find/Replace (on the find part) already does a wildcard search with the format of <search string*>
