If you click yourself at 3 clicks per second, that's fine.
Because you get 3 inputs for 3 key actions.

The only time multiple outputs for a single press is ok.
Is things like pressing W and Q at once, to move and strafe which is possible to do at once within the base wow client.
Or a keybind like Alt + M, is two keys, but you can press both with one keymap.
These are simultaneous keys, which combine for one action at a time on one press.

You can configure a key to do an action for as long as you hold the key.
For example movement keys.

Anything which involves a delay or timed repeat will eventually get you banned.
The G15/G11 can do this function, but your account is not worth the risk.
As far as I know, you cannot do this with any of the major boxing programs like IS, HKN, KC, GCP, PB etc.
Not that you'd want to.