Patrick Paige, an associate with Perkins & Will in Charlotte, NC, wrote to me suggesting this item fits into this department nicely. He wrote:
When adding matchlines something was bothering me about the parameters. I realized that they flipped the locations of the “Base Constraint” and “Top Constraint.” For walls, shafts, etc. the order is bottom-top. For matchlines the order is top-bottom.
I agree...subtle. I recall something else that is different in this way, perhaps it is the wall opening tool. I'll have to check!