DRO questions

Bolt Hole Pattern:
I see several DRO's have a feature for Bolt Hole Pattern.
If a DRO output is not connected to a controller of a mill how does it help in doing a Bolt Hole Pattern ?
Just how is it used ?

Tracking Speed:
I'm getting feedback that my design needs to be faster than 15 inches per second.
Is 15 inches per second a serious limitation ?
If it is a serious limitation, then what should I aim for as a tracking speed ?

I've checked out several commercial DRO's and many do not even mention that as a specification !

Best Regards
Hans Wedemeyer