Yeah I have used that, but man it can get messy fast. Especially with apache mod configs, and using taglibs to generate localized links (taglibs sometimes append on a session id). I think the easiest approach is to just put static files on a web server rather than embedding in a war/ear file. I hate to say that but its true. A servlet container is probably not the best place to store static content. So maybe thats why an exclude feature is not on the horizon even for the 3.0 servlet spec.
and POOF! You're gone! But look, this tiny ad is still here: