If your post has a .psb file of the same name (e.g., 5Axis_Mazak.psb ), you cannot customize much without the original developer’s source code. You are limited to:

Managing Coolant CodesModern machines often have multiple coolant options: flood, mist, through-spindle, or high-pressure air. If your post only outputs M08, you can modify the coolant logic to recognize Mastercam's X-style coolant commands, ensuring the right M-code is paired with the right operation every time.

A paid editor designed specifically for CNC posts. It offers back-plotting of your post output, variable tracking, and intelligent auto-complete.