Hello Claudine,
Yes, you’re right, a line of dots for the brush head would do it.
As for the different settings within the brush, that’s a matter of trial and error to see what works for you.
As I was feeling curious I had a little experiment this morning, the results of which are in the link below.
They may or may not actually prove useful to you, but they are what they are!
(Although they are not needed for the ARPack to work, I’ve also included the images I used for the brush heads so you can see what they look like more easily and perhaps give you ideas for your own experiments).
Dropbox Link: Custom Brush Combs
Maker Of Replica Macoys
Techie Stuff:
ArtRage 6.1.1 ~ 15" Macbook Pro ~ macOS 10.14.6 ~ 4 Core i7 3.1GHz CPU ~ 16GB RAM ~ Wacom Intuos4 M