A complete keys and mouse reference for the latest version of Inkscape is here:
The same reference in SVG is available via Help > Keys and Mouse in Inkscape. This SVG version is more up-to-date in CVS. Both HTML and SVG versions are generated from doc/keys.xml in the source tree. If you need to change something, edit the XML file and run:
saxon doc/keys.xml doc/keys-svg.xsl > icons/keys.svg saxon doc/keys.xml doc/keys-html.xsl > doc/keys.html
Then commit all changed files (XML, HTML, SVG, XSLT). Before a new release, copy the latest HTML file to inkscape_web/doc so it it also available from the site, and update version in inkscape_web/index.php.