Changing the registry will only affect the machine you are working on and will affect all jobs until you change it back.
As soon as you open the same job on another machine there will be no change unless you alter the registry there as well.
Layer priority numbers will not affect two surfaces that are in the same plane and touching.
They will still blend as if one surface - it will just stop the mitring at corners.
In 3D if using the Internal Engine you can set contours to 'Draft' but this won't affect your elevations.
The best way I know is to duplicate your material and give them slightly different names - i.e. 'brick_01' & 'brick_02'.
Then assign a different material to each adjoining surface.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11