in fact, you can use F1 as hotkey for the first config(without rapid fire)
and use "CAPS LOCK" as hotkey for the second config(with rapid fire).
and choose a suitable "Load Behavior" in "More settings".
This option will change the behavior of your configuration, after it was activated by hotkey.
There are three choices: Standard, Temporary Hold, and Temporary Toggle.
Standard: The configuration is activated by its hotkey and stays active.
Temporary Hold: The configuration is activated only when its hotkey is pressed and the previous configuration will be reloaded back when the hotkey is released.
Temporary Toggle: The configuration is activated after its hotkey is invoked and the previous configuration will be reloaded back when the hotkey is invoked again.