Welcome to LinuxCNC.org

The StepConf Wizard is a nice quick start tool I use it often
one thing that would make things even easer would be a
custom INI file, that functions like the custom HAL file.
this would save a bit of reediting the INI file every time
I use the StepConf Wizard to make a change.

Perhaps there is a existing trick to accomplish this but
I don't know it.

Thanks

Why are you editing the INI file everytime?
I can't see how a custom INI file could work well as the INI is searched by heading first then item, so if you wanted to customize on item you have to copy
all the other items (under that heading) too. Or else we would have to change the way Linxcnc looks up stuff in the INI file.

In most cases if you are custom editing the INI file for what options you want then you should probably stop using stepconf and just edit directly.
On the other hand if the edits you are doing are broadly useful maybe we could add the option the stepconf.