Many PRs in this repository fall into specific categories, e.g. implementation of warnings / formatting changes which are not possible to enable by default, or just resolving very specific needs.
Right now there's no branching or flags-system for implementing these besides submitting them as part of core buildifier / buildozer. If we defined a separate directory and interface for experimental warnings we could simplify the process of getting custom checks merged, and through this enable better support for buildtools users.