If you are looking to create a "feature" (functional enhancement) for a project contained within this archive, or if you meant to ask about features for the format itself, here are the standard capabilities and ways to work with it: Common Features of 7z Archives
Uses the LZMA and LZMA2 algorithms to significantly reduce file sizes. Stepu.7z
Supports AES-256 encryption to protect your data with a password. If you are looking to create a "feature"