Hello.
In the coming days, I will propose a guide to upgrade your theme to the new variables and I will list all the new supported variables so you can use them without any worry. I just don’t want to write it too quickly because there are a few variables to adjust using your feedbacks.
We’ve been stuck for years with unofficial theme variables using --paper-item things. We want to propose a better way to theme things, officially supported.
I try to read feedbacks, ignore non-constructive complaints and do PRs to fix things as much a possible. 