Clay,
We have received many requests for this, and it is part of our hatch overhaul project that is currently ongoing.
The reason it is not such an easy solution, is that not all hatch patterns are designed at a "1:1" scale, where 1.0 scale would be at true size. Further, what's true size, inches or feet or millimeters? Then you also have the issue of user-supplied hatches, where a user finds a paver hatch and wants Land F/X to scale it at true scale. How is the system to know from some random hatch pattern what true scale is?
Further, the way our hatch system was designed, was to scale patterns so they always appear the same scale in Paperspace regardless of the drawing scale. So it was just never designed for a capability of having a hatch always placed at a consistent scale.
So in the scenario you describe, yes, Land F/X will always scale the provided hatch, assuming that you want it scaled as per the drawing scale. You will need to then manually set its scale after the fact back to 1.0, or whatever scale factor will result in it being at true scale. With the release of our overhauled hatch library, it will have the ability to set a hatch to always come in at a consistent scale, along with a unit setting. That will be rolling out in the first half of next year.
--J