The images we have run on several generations of workstations which have
varying size hard drives.

Is there a system setting somewhere to force ZenWorks to use 100% of a
workstations hard drive?

I found documentation about using IMGEXP.EXE, however, it only talks about
setting a new size. I want to know if there is a place I can simply set it
to use 100% of any drive that is imaged.