It would be really helpful to be able to specify which render node to use and independently specify which camera to use. Because I'm working on a project where my boss wanted two cameras at two different render qualities each. So I ended up having to save out 4 different files in order to accomplish this. If anything changed in the master file, I had to remember which settings to restore and then save it back out. It just became a bear to keep track of everything. It would be much simpler to deal with if these settings were exposed to the command line.
Also I found that if an -ox is not specified and one is still specified in the render node. It will save one out. If an -ox is not specified in a job submitted from the command line, it should not be saved.
I'm still working with Preview version...so if something has changed in the final version let me know.