IMHO I think would be better use the context of the webapp. Some times you need to update/redeploy the same webapp (web context) using a different WAR name (e.g when you use some build tool like maven that appends the version number to the pkg name - MyWebApp-1.0.1.war), but the web context remains the same.
Today if you need to change the WAR file name RHQ handles it as a different/unique resource. What do you think about this? Is there any bugzilla about this issue?