...I guess Bertrand's purpose is not to use it on production servers, but to have a small standalone server that can be used for e.g. demonstrations.
Exactly, demos and teaching.
Problem is, with the current setup people will tend to experiment under build/webapp and will lose their work if they do a "build clean" later on (even with symbolic links as ant does a recursive delete of files). It happened to me ;-)
It know it's their fault but from a marketing point of view it looks bad, hence my proposal for an easy way to move stuff elsewhere for experimenting.
-Bertrand