It's not creating queue.
If you exceed the amount 1000 recaptcha images for 1 threads per hour, the delay for solving recaptcha will be added.
So that recaptcha won't treat you and our software as bots.
I've just explained you that you are getting a warning that recaptcha will be solved with some delay.
There is no need in 2 licenses or extra threads. Just test and try working with it. Do you get big delays? unsolved captchas?