Wikimedia Bugzilla is closed!

I don't know if this is the right place to ask, but i didn't find a better one, hope 
it is okay.

I have feature request for MediaWiki: I have built a Wiki containing lots of 
articles, text and sample codes I found on the web. What I would like to do is to set 
up an automatically created index or keyword list, like it can be also found at the 
end of books.

I want to put a simple tag to the end of the article, similar to Categories 
[[Category:XX]]

Result should be to get a page showing me an index, let's say for letter M, like:

* Microsoft Excel
 ** Article 1
 ** Article 2
 ** Article 3
* Microsoft Outlook
 ** Article 1
 ** Article 2
* Microsoft Word
 ** Article 1
and so on...

Yes, I know, I can do something like this with categories. But what I don't like with 
categories:

1. I have to create a new page for every keyword I use
2. I don't want to have a seperate page for every keyword, I want to have a list of 
all keywords starting with "M", and there showing directly the page links

Can something like this be done with existing extensions or tags? I didn't find 
anything...