You can edit conf/Server.xml and modify the AdminInterface/ObjectList. This controls what is available via JMX and jConsole. Client & MediaStream is disabled by default because it can cause performance issues with jConsole on a busy server. If using your own scripts to access JMX then it shouldn't be a problem because you are not trying to load the complete object list at once.
Alternatively, you could write a custom HTTP Provider to get the information that you need.