I was attempting to set differing brim for a set of parts in a plate I was printing and noticed that some of the settings are not respected/profile.
The number of Outlines and the number of Layers to print are not respected in profiles beyond the first one.
Try setting your brim to 3 outlines, 1 layer, 4mm from the part, then in a second profile on a second object, change the number of outlines to 6, 2 layers and zero distance from the part.
You will see the distance respected in the second part but you will end up with 3 outlines and 1 layer instead of 6 and 2.
This was something I was trying to do to deal with very small geometry for a few parts that were lifting, the rest of the plate didn't need all the extra outlines 4mm away from them, or any brim at all really.