There are pencil icons next to forum posts so they are editable.
FAQ - nope don't have one, would be nice.
Downloads - see Shared Files Module
Tutorial - System - whatever that means, we don't have one. Would be great to implement a SCORM courseware system, we don't have one but there are other open source projects that could be integrated depending on license compatibility.
We have 2 galleries, if you don't like either one you are free to implement something. I'd like to have Flickr gallery and it would probablyt be easy to do using existing code available from Flickr.NET project or others.
Anything we don't have you are welcome to do.