[Dan Thomsen]

More descriptive layer names would have helped me understand how to modifiy the stencil.

You could create an invisible layer with some instructions.

You could create a script that takes the set of selected items and moves them to the correct level and locks them.

You could create two "buttons" that set parameters. For example the script could prompt the user for the dimension and then save it in the stencil. You would need a "reset to default values" button as well

Dan