Noticed that the cbectl options don't appear to match what is offered in the tool.
For example in 5.5.3/6.0 the tool offers the ability to change.
But the documentation refers to
Also the limit described in the Performance tuning options
"All these options can be used only to tune down the number of threads: if the value was set as N at initial startup, then only a value < N will work."
is now outdated (as of 5.0) given the following MB-22041