Keyboard shortcuts

Hi  folks 
I hope I am asking  in the correct forum . 
I have a question about keyboard shortcuts which I wish to use  in operating a Mirac lathe  .  I am working with Gmocappy GUI  in Debian 2.8.4

The wiki gives a page of common shortcuts       LinuxCNC Documentation Wiki: Keyboard Shortcuts
I find that while a number of these  are  working with my keyboard (out of the box)  I am sadly finding that a number of my preferred ones do not .
 
I am looking to construct a panel  with momentary buttons  replicating  a selected number of  key presses . 
Of the dozen or so that I have selected I find that the following are not working.   F4, F8, F9, and a/A
Page Up/down do not jog my z axis , (although  up/down arrows do perform that function.)

Continuing down the wiki page it gives key binding instructions. Do I need to add these instructions into my files, and if so which file?
Do I need to add them all  ( there is a possibility that I may want to add buttons )  or do I just need to add the pertinent ones for now?

Thanks !
John



 

Anyone???

You can use hal_input (linuxcnc.org/docs/html/man/man1/hal_input.1.html)  and connect your keyboard buttons in hal.

Or you can modify the gmoccapy source file and add keys under