Railo - important path placeholders

I'm playing around with railo, a full featured alternative CFML engine and so far, I'm very impressed. During testing my existing applications with this new environment I had to add some custom mappings in the administration (by the way, there are two admin engines, the first one is server-wide, the second one just for the current webroot).

When creating these custom mappings, there are some very interesting path placeholders you can use:
{railo-web}: path to the railo web directory typical "{web-root}/WEB-INF/railo"
{railo-server}: path to the railo server directory typical where the railo.jar is located
{temp-directory}: path to the temp directory of the current user of the system
{home-directory}: path to the home directory of the current user of the system
{web-root-directory}: path to the web root
{system-directory}: path to thesystem directory

This way you can create mappings without using the full path to the directory - very cool!