Drag and drop upload is an HTML5 feature. Chrome, Firefox (using the file API and AJAX) and Safari also have some kind of support for it over HTML4. All other way of doing this imply very, very bad hack. It is better to wait until HTML5 is well established before adding that feature. Doing it right now imply some dirty hacks, just as drag and drop in general. You can do it, search for drag and drop file on google, find some javascript bits and use them, mediawiki is open source after all.
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