I am using a AVID CNC to flatten wood slabs. I use the keyboard arrow keys to verify the high spots to identify where my Z will home at.
This is slow and I have seen discussion of using a Joy Stick controler to quickly move the cutter where you want it before starting a script. 

Can something like this work?

https://www.bhphotovideo.com/c/product/1032478-REG/x_keys_xk_0983_uaj12_r_xk_12_joystick_with.html

Any recomendations?

Thanks
Francis

Certainly with Mach3 there's a software plug in that allows the use of an xbox controller which can be wired or wireless.  I'm sure there must be something similar for mach 4.

https://www.machsupport.com/forum/index.php?topic=31171.0