@leaverou The docs don't cover those topics exactly, but they are nice entry points:
- https://gerrit-review.googlesource.com/Documentation/intro-gerrit-walkthrough-github.html
- https://gerrit-review.googlesource.com/Documentation/intro-user.html#multiple-features

And you can apparently configure "cherry-pick" as a merge strategy for your project, but it'd be very error-prone in my opinion (you need to remember to merge in the right order): https://gerrit-review.googlesource.com/Documentation/config-project-config.html#cherry_pick