github merge options (merge commit vs. rebase-and-merge)

this refers to the 'Merge pull request' button on github, and its options for the merge strategy. the only option enabled for the ceph.git repo is 'create a merge commit', and that's the right default for main and stable release branches but for feature branches that aren't ready to merge to main, i'd like the option to use 'rebase and merge'. that way, we can target pull requests at the feature branch and merge them without merge commits. then once the feature branch is stable and ready, we can open a pull request to merge the feature branch to main as i understand it, there's a policy not to include merge commits in pull requests, though i don't see it documented in https://docs.ceph.com/en/latest/dev/developer_guide/basic-workflow/#merging is there a way to adjust github's merge strategy so that the 'create a merge commit' option is only enforced for stable branches?