Actually Wouter Trini's doing it right for how the CSS/JS/etc used to be handled. It's not moving, it's copying the html dir to apache so it can serve the resources directly. Apache won't serve from the tomcat webapps folder (unless you've really mucked with the directives), so copying html into docroot will allow apache to serve the static resources w/o hitting tomcat.
The problem you have Trini is that Liferay has moved away from static css in lieu of dynamic css compiled by compass.
These days you're better off using a caching appliance such as Varnish between apache and tomcat. Varnish monitors the cache headers for returned data from tomcat and will, in turn, return cached content back to apache when it can.
Varnish is super easy to stand up and you'll notice a huge improvement in performance and no need to worry about jkUnmount directives.
