While I run a few vbulletin sites for larger forums.. The Nop Forum is nice to have and works great..
One thing I wouldn't mind is a better way to attach images..
There is the BBCode text editor but there are NO options to it..
The full HTML one works as long as you know what you are doing but for basic uses I would love a simple Image button.. or even an Image Upload feature..
1)Better Code posting, current [Code.] tag doesn't make any different between text and code, it should work like other editors like TinyMCE or Syntax poster : here's a screenshot: http://img834.imageshack.us/img834/4113/codeposting.jpg
2) We all make use of signature in forums, but currently BBCode doesn't allow HTML codes in it. So no one can post a hyperlink or make text as link in signature.