[Mediawiki-l] idea: MediaWiki summary extension

I'm not a programmer, but I understand that extensions can do some pretty powerful stuff. I have been thinking that a summary extension would be a perfect supplement to weblogging templating that I hacked together. A summary extension would work just like the gallery tag. It would create previews of its associated pages. <summary> page one page two page three </summary> The things I would want it to do: * Customize the header * Begin the summary at the first horizontal rule * Be able to specify an image to use as a thumbnail for the summary. Would such a thing even be feasible to make? http://jrandomhacker.info/mw/index.php/MediaWiki_summary_extension