Michael,
The limitation tab will only limit the number of CAL's for both nodes, it won't work as or sort of CALs load balancer, and unfortunately, I do not think there is a way to load balance CALs or predetermining what CALs and numbers CALs can be use for each node within a cluster environment.
Maybe someone else has another type of solution, good luck!
Gio
Giuseppe Novello
Principal Technical Support Engineer @ Qlik