Make a custom command that contains the following code
set mom_sys_enable_ball_center_output 1
then place it in Program Start Sequence, Start of Program - at the top, so it is the first thing.
You will have to do this for all posts that require it.
It is not exactly turning it on by default, but it will ensure that it is turned on for the posts that need it.
Production: NX10.0.3.5, Vericut 7.4.1, ICAM V21Development: VB.NET, Tcl/TkTesting: NX11