Yes you can set it via an environment variable (UV_NATIVE_TLS=true) or in your uv.toml (native-tls = true). However, check the docs, I think they are renaming it to sytem-certs.
Looks like I forgot to answer the other half :) Yes you can pin a specific Python like `uv python pin cpython-3.14.0-macos-aarch64-none`, it will create a `.python-version` file which will be respected when you’re in the directory.
