Setting two or more baluster-patterns in railing family

[YaGitHub]

What I want:

As far as I know, only one baluster pattern can be set in railing system family as following.

I would like to set two or more patterns of baluster.

Reason:

I'm trying to make conveyer-family as railing system family as see "https://forums.autodesk.com/t5/revit-mep-forum/lt-technic-gt-a-simple-way-to-make-conveyer-family-an..."

Here I implement legs as baluster. And for more precise, I wanna add rollers as baluster, but only one baluster pattern can be used (Roller can't be added).

If many baluster can be added, flexibility of railing system family should be nice!

Regards,