I made this exact same misunderstanding before (it's not very well documented either:

1)  All the control files in all of Autotest are just "examples", they're easily copied and customized for site-specific needs.
2)  The control file serves **as** the configuration for the overall test execution.  Therefor it's generally not acceptable to bring test-subject (or sub, or sub-sub test) configuration options in.  To make an analogy, it would be as if a bus driver asked an incoming passenger to drive the bus.

Hint:  You can use #1 to solve #2 :grinning:

(let me know if you can't figure it out or if this is not clear - it was confusing for me also, at first)