Snappy auto-generating boundary file
 

Hello everybody,
I'm looking for a way to tell snappyHexMesh to create a boudary file (in polyMesh) containing "patch" objects and not "wall".

More precisely, I have an .stl file with three regions. I want two of those regions to be snappied as "patch" type, and not "wall" type - which instead comes out by default.

Any idea? May I skip the post-processing editing of this file?

Thank you.